Thursday, September 15, 2016

esomeprazole and naproxen


Generic Name: esomeprazole and naproxen (ee soe MEP ra zole and na PROX en)

Brand Names: Vimovo


What is esomeprazole and naproxen?

Naproxen is a nonsteroidal anti-inflammatory drug (NSAID). It works by reducing substances in the body that cause inflammation, pain, and fever.


Esomeprazole is a proton pump inhibitor. It decreases the amount of acid produced in the stomach.


The combination of esomeprazole and naproxen is used to treat symptoms of osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis. The esomeprazole in this medication helps reduce the risk of stomach ulcers in people who may be at risk for them while receiving treatment with an NSAID.


Esomeprazole and naproxen may also be used for purposes not listed in this medication guide.


What is the most important information I should know about esomeprazole and naproxen?


The naproxen in this medicine may cause life-threatening heart or circulation problems such as heart attack or stroke, especially if you use it long term. Do not use this medicine just before or after heart bypass surgery (coronary artery bypass graft, or CABG).


Get emergency medical help if you have chest pain, weakness, shortness of breath, slurred speech, or problems with vision or balance.

Naproxen may also cause serious effects on the stomach or intestines, including bleeding or perforation (forming of a hole). These conditions can be fatal and can occur without warning while you are taking esomeprazole and naproxen, especially in older adults.


Call your doctor at once if you have symptoms of stomach bleeding such as black, bloody, or tarry stools, or coughing up blood or vomit that looks like coffee grounds. Ask a doctor or pharmacist before using any other pain or arthritis medicine. Many medicines available over the counter contain naproxen or similar medicines (such as aspirin, ibuprofen, or ketoprofen). Taking naproxen during the last 3 months of pregnancy may result in birth defects. Do not take esomeprazole and naproxen during pregnancy unless your doctor has told you to.

What should I discuss with my healthcare provider before taking esomeprazole and naproxen?


You should not use this medication if you are allergic to esomeprazole (Nexium) or naproxen (Aleve, Anaprox, Naprosyn, and others), or if you have ever had a severe allergic reaction to aspirin or other NSAIDs. Do not use esomeprazole and naproxen just before or after heart bypass surgery (coronary artery bypass graft, or CABG).

The naproxen in this medicine may cause life-threatening heart or circulation problems such as heart attack or stroke, especially if you use it long term.


Naproxen may also cause serious effects on the stomach or intestines, including bleeding or perforation (forming of a hole). These conditions can be fatal and can occur without warning while you are taking esomeprazole and naproxen, especially in older adults.


To make sure you can safely take esomeprazole and naproxen, tell your doctor if you have any of these other conditions:


  • liver or kidney disease;


  • heart disease, high blood pressure, fluid retention, or a history of stroke, heart attack, or congestive heart failure;




  • low levels of magnesium in your blood;




  • a bleeding or blood clotting disorder, such as hemophilia;




  • a history of stomach ulcer, stomach bleeding, or intestinal disorder (Crohn's disease, ulcerative colitis);




  • asthma, or a history of allergic reaction to aspirin, especially aspirin triad syndrome; or




  • if you smoke.




Taking esomeprazole may increase your risk of bone fracture in the hip, wrist, or spine. This effect has occurred mostly in people who have taken the medication long term or at high doses, and in those who are age 50 and older. It is not clear whether esomeprazole is the actual cause of an increased risk of fracture. Tell your doctor if you have osteoporosis or osteopenia (low bone mineral density). FDA pregnancy category D. Tell your doctor if you are pregnant or plan to become pregnant during treatment. Taking naproxen during the last 3 months of pregnancy may result in birth defects. Do not take esomeprazole and naproxen during pregnancy unless your doctor has told you to. Naproxen can pass into breast milk and may harm a nursing baby. You should not breast-feed while taking esomeprazole and naproxen.

How should I take esomeprazole and naproxen?


Take exactly as prescribed by your doctor. Do not take in larger or smaller amounts or for longer than recommended. Follow the directions on your prescription label.


Esomeprazole and naproxen is usually taken 2 times each day, at least 30 minutes before a meal. Follow your doctor's instructions.


Take this medication with a full glass of water. Do not crush, chew, or break an enteric coated pill. Swallow it whole. The enteric coated pill has a special coating to protect your stomach. Breaking the pill will damage this coating.

To be sure this medication is not causing harmful effects, your blood may need to be tested often. Your blood pressure and kidney or liver function may also need to be tested. You may also need eye exams if you have any changes in your vision. Visit your doctor regularly.


This medication can cause unusual results with certain medical tests. Tell any doctor who treats you that you are using esomeprazole and naproxen.


Store at room temperature away from moisture, heat, and light.

See also: Esomeprazole and naproxen dosage (in more detail)

What happens if I miss a dose?


Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.


What happens if I overdose?


Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include feeling weak or tired, nausea, vomiting, stomach pain or discomfort, severe dizziness or drowsiness, bleeding, uncontrolled muscle movements, weak or shallow breathing, or loss of coordination.


What should I avoid while taking esomeprazole and naproxen?


Ask a doctor or pharmacist before using any other pain or arthritis medicine. Many medicines available over the counter contain naproxen or similar medicines (such as aspirin, ibuprofen, or ketoprofen). Taking certain products together can cause you to get too much of a certain drug. Check the label to see if a medicine contains naproxen or another NSAID.

Ask your doctor before using an antidepressant such as citalopram (Celexa), escitalopram (Lexapro), fluoxetine (Prozac, Sarafem, Symbyax), fluvoxamine (Luvox), paroxetine (Paxil), or sertraline (Zoloft). Taking any of these drugs with an NSAID may increase your risk of stomach bleeding.


Avoid drinking alcohol. It may increase your risk of stomach bleeding.

Esomeprazole and naproxen side effects


Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using esomeprazole and naproxen and call your doctor at once if you have a serious side effect such as:

  • pale skin, easy bruising, unusual bleeding, or any bleeding that will not stop;




  • chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling;




  • sudden numbness or weakness, especially on one side of the body;




  • sudden headache, confusion, problems with vision, speech, or balance;




  • pain, swelling, warmth, or redness in one or both legs;




  • low magnesium (dizziness, confusion, fast or uneven heart rate, jerking muscle movements, jittery feeling, muscle cramps, muscle weakness or limp feeling, cough or choking feeling, seizure);




  • urinating less than usual or not at all;




  • swelling, rapid weight gain, feeling short of breath (even with mild exertion);




  • black, bloody, or tarry stools, coughing up blood or vomit that looks like coffee grounds;




  • nausea, upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes); or




  • severe skin reaction -- fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.



Less serious side effects may include:



  • constipation, diarrhea; or




  • mild stomach pain.



This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Esomeprazole and naproxen Dosing Information


Usual Adult Dose for Ankylosing Spondylitis:

Esomeprazole-naproxen: 20 mg-375 mg or 20 mg-500 mg: one tablet orally twice daily.

Usual Adult Dose for Osteoarthritis:

Esomeprazole-naproxen: 20 mg-375 mg or 20 mg-500 mg: one tablet orally twice daily.

Usual Adult Dose for Rheumatoid Arthritis:

Esomeprazole-naproxen: 20 mg-375 mg or 20 mg-500 mg: one tablet orally twice daily.


What other drugs will affect esomeprazole and naproxen?


Tell your doctor about all other medicines you use, especially:



  • cholestyramine (Prevalite, Questran);




  • digoxin (digitalis, Lanoxin);




  • lithium (Eskalith, Lithobid, others);




  • methotrexate (Rheumatrex, Trexall);




  • probenecid (Benemid);




  • St. John's wort;




  • tacrolimus (Prograf);




  • an iron supplement;




  • a blood thinner such as warfarin (Coumadin, Jantoven);




  • steroids (prednisone and others);




  • medication used to prevent blood clots, such as clopidogrel (Plavix), ticlopidine (Ticlid), and others;




  • a diuretic (water pill) such as furosemide (Lasix);




  • antifungal medication such as ketoconazole (Nizoral) or voriconazole (Vfend);




  • HIV medication such as atazanavir (Reyataz) or nelfinavir (Viracept);




  • aspirin or other NSAIDs such as ibuprofen (Advil, Motrin), naproxen (Aleve, Naprosyn, Naprelan, Treximet), celecoxib (Celebrex), diclofenac (Arthrotec, Voltaren), indomethacin (Indocin), meloxicam (Mobic), and others;




  • an ACE inhibitor such as benazepril (Lotensin), enalapril (Vasotec), lisinopril (Prinivil, Zestril), quinapril (Accupril), or ramipril (Altace); or




  • a beta-blocker such as atenolol (Tenormin, Tenoretic), carvedilol (Coreg), labetalol (Normodyne, Trandate), metoprolol (Dutoprol, Lopressor, Toprol), nadolol (Corgard), propranolol (Inderal, InnoPran), or sotalol (Betapace).



This list is not complete and other drugs may interact with esomeprazole and naproxen. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.



More esomeprazole and naproxen resources


  • Esomeprazole and naproxen Dosage
  • Esomeprazole and naproxen Use in Pregnancy & Breastfeeding
  • Esomeprazole and naproxen Drug Interactions
  • Esomeprazole and naproxen Support Group
  • 6 Reviews for Esomeprazole and naproxen - Add your own review/rating


Compare esomeprazole and naproxen with other medications


  • Ankylosing Spondylitis
  • NSAID-Induced Ulcer Prophylaxis
  • Osteoarthritis
  • Rheumatoid Arthritis


Where can I get more information?


  • Your pharmacist can provide more information about esomeprazole and naproxen.


Errin



norethindrone

Dosage Form: tablet
Errin®

(norethindrone tablets, USP 0.35 mg)

Patients should be counseled that this product does not protect against HIV infection(AIDS) and other sexually transmitted diseases.


Rx only


Rev. A 6/2011



Errin Description



Norethindrone Tablet 28 Day Regimen


Norethindrone USP is a white to creamy white, odorless, crystalline powder. It is stable in air. Practically insoluble in water; soluble in chloroform and in dioxane; sparingly soluble in alcohol; slightly soluble in ether. The chemical name for norethindrone is 17-Hydroxy-19-nor-17α-pregn-4-en-20-yn-3-one. The structural formula is as follows:


C20H26O2 M.W. 298.42



Each yellow tablet contains 0.35 mg norethindrone USP, and has the following inactive ingredients: anhydrous lactose, corn starch, D&C yellow no. 10 aluminum lake, ethylcellulose aqueous dispersion, lactose monohydrate, magnesium stearate, microcrystalline cellulose and povidone.


Meets USP Dissolution Test 2.



Errin - Clinical Pharmacology



1. Mode of Action


Errin® progestin-only oral contraceptives prevent conception by suppressing ovulation in approximately half of users, thickening the cervical mucus to inhibit sperm penetration, lowering the midcycle LH and FSH peaks, slowing the movement of the ovum through the fallopian tubes, and altering the endometrium.



2. Pharmacokinetics


Serum progestin levels peak about two hours after oral administration, followed by rapid distribution and elimination. By 24 hours after drug ingestion, serum levels are near baseline, making efficacy dependent upon rigid adherence to the dosing schedule. There are large variations in serum levels among individual users. Progestin-only administration results in lower steady-state serum progestin levels and a shorter elimination half-life than concomitant administration with estrogens.



Indications and Usage for Errin



1. Indications


Progestin-only oral contraceptives are indicated for the prevention of pregnancy.



2. Efficacy


If used perfectly, the first-year failure rate for progestin-only oral contraceptives is 0.5%. However, the typical failure rate is estimated to be closer to 5%, due to late or omitted pills. Table 1 lists the pregnancy rates for users of all major methods of contraception.



































































































































Table 1: Percentage of Women Experiencing an Unintended Pregnancy During the First Year of Typical Use and the First Year of Perfect Use of Contraception and the Percentage Continuing Use at the End of the First Year. United States.
% of Women Experiencing an Unintended Pregnancy within the First Year of Use% of Women Continuing Use at One Year3
Method (1)Typical Use1 (2)Perfect Use2 (3)(4)
Chance48585
Spermicides526640
Periodic abstinence2563
Calendar9
Ovulation Method3
Sympto-Thermal62
Post-Ovulation1
Cap7
Parous Women402642
Nulliparous Women20956
Sponge
Parous Women402042
Nulliparous Women20956
Diaphragm720656
Withdrawal194
Condom8
Female (Reality®)21556
Male14361
Pill571
Progestin Only0.5
Combined0.1
IUD
Progesterone T21.581
Copper T380A0.80.678
LNg 200.10.181
Depo-Provera®0.30.370
Norplant® and0.050.0588
Norplant-2®
Female Sterilization0.50.5100
Male Sterilization0.150.10100

Adapted from Hatcher et al, 1998, Ref. # 1.


Emergency Contraceptive Pills: Treatment initiated within 72 hours after unprotected intercourse reduces the risk of pregnancy by at least 75%.9


Lactational Amenorrhea Method: LAM is highly effective, temporary method of contraception.10


Source: Trussell J, Contraceptive efficacy. In Hatcher RA, Trussell J, Stewart F, Cates W, Stewart GK, Kowal D, Guest F, Contraceptive Technology: Seventeenth Revised Edition. New York NY: Irvington Publishers, 1998.


1 Among typical couples who initiate use of a method (not necessarily for the first time), the percentage who experience an accidental pregnancy during the first year if they do not stop use for any other reason.


2 Among couples who initiate use of a method (not necessarily for the first time) and who use it perfectly (both consistently and correctly), the percentage who experience an accidental pregnancy during the first year if they do not stop use for any other reason.


3 Among couples attempting to avoid pregnancy, the percentage who continue to use a method for one year.


4 The percents becoming pregnant in columns (2) and (3) are based on data from populations where contraception is not used and from women who cease using contraception in order to become pregnant. Among such populations, about 89% become pregnant within one year. This estimate was lowered slightly (to 85%) to represent the percent who would become pregnant within one year among women now relying on reversible methods of contraception if they abandoned contraception altogether.


5 Foams, creams, gels, vaginal suppositories, and vaginal film.


6 Cervical mucus (ovulation) method supplemented by calendar in the pre-ovulatory and basal body temperature in the post-ovulatory phases.


7 With spermicidal cream or jelly.


8 Without spermicides.


9 The treatment schedule is one dose within 72 hours after unprotected intercourse, and a second dose 12 hours after the first dose. The Food and Drug Administration has declared the following brands of oral contraceptives to be safe and effective for emergency contraception: Ovral® (1 dose is 2 white pills), Alesse® (1 dose is 5 pink pills), Nordette® or Levlen® (1 dose is 2 light-orange pills), Lo/Ovral® (1 dose is 4 white pills), Triphasil® or Tri-Levlen® (1 dose is 4 yellow pills).


10 However, to maintain effective protection against pregnancy, another method of contraception must be used as soon as menstruation resumes, the frequency or duration of breastfeeds is reduced, bottle feeds are introduced, or the baby reaches six months of age.


Norethindrone Tablets have not been studied for and are not indicated for use in emergency contraception.



Contraindications


Progestin-only oral contraceptives (POPs) should not be used by women who currently have the following conditions:


  • Known or suspected pregnancy

  • Known or suspected carcinoma of the breast

  • Undiagnosed abnormal genital bleeding

  • Hypersensitivity to any component of this product

  • Benign or malignant liver tumors

  • Acute liver disease


Warnings


Cigarette smoking increases the risk of serious cardiovascular disease. Women who use oral contraceptives should be strongly advised not to smoke.


Norethindrone tablets do not contain estrogen and, therefore, this insert does not discuss the serious health risks that have been associated with the estrogen component of combined oral contraceptives (COCs). The healthcare professional is referred to the prescribing information of combined oral contraceptives for a discussion of those risks. The relationship between progestin-only oral contraceptives and these risks is not fully defined. The healthcare professional should remain alert to the earliest manifestation of symptoms of any serious disease and discontinue oral contraceptive therapy when appropriate.



1. Ectopic Pregnancy


The incidence of ectopic pregnancies for progestin-only oral contraceptive users is 5 per 1000 woman-years. Up to 10% of pregnancies reported in clinical studies of progestin-only oral contraceptive users are extrauterine. Although symptoms of ectopic pregnancy should be watched for, a history of ectopic pregnancy need not be considered a contraindication to use of this contraceptive method. Healthcare professionals should be alert to the possibility of an ectopic pregnancy in women who become pregnant or complain of lower abdominal pain while on progestin-only oral contraceptives.



2. Delayed Follicular Atresia/Ovarian Cysts


If follicular development occurs, atresia of the follicle is sometimes delayed and the follicle may continue to grow beyond the size it would attain in a normal cycle. Generally these enlarged follicles disappear spontaneously. Often they are asymptomatic; in some cases they are associated with mild abdominal pain. Rarely they may twist or rupture, requiring surgical intervention.



3. Irregular Genital Bleeding


Irregular menstrual patterns are common among women using progestin-only oral contraceptives. If genital bleeding is suggestive of infection, malignancy or other abnormal conditions, such nonpharmacologic causes should be ruled out. If prolonged amenorrhea occurs, the possibility of pregnancy should be evaluated.



4. Carcinoma of the Breast and Reproductive Organs


Some epidemiological studies of oral contraceptive users have reported an increased relative risk of developing breast cancer, particularly at a younger age and apparently related to duration of use. These studies have predominantly involved combined oral contraceptives and there is insufficient data to determine whether the use of POPs similarly increases the risk.


A meta-analysis of 54 studies found a small increase in the frequency of having breast cancer diagnosed for women who were currently using combined oral contraceptives or had used them within the past ten years.


This increase in the frequency of breast cancer diagnosis, within ten years of stopping use, was generally accounted for by cancers localized to the breast. There was no increase in the frequency of having breast cancer diagnosed ten or more years after cessation of use.


Women with breast cancer should not use oral contraceptives because the role of female hormones in breast cancer has not been fully determined.


Some studies suggest that oral contraceptive use has been associated with an increase in the risk of cervical intraepithelial neoplasia in some populations of women. However, there continues to be controversy about the extent to which such findings may be due to differences in sexual behavior and other factors. There is insufficient data to determine whether the use of POPs increases the risk of developing cervical intraepithelial neoplasia.



5. Hepatic Neoplasia


Benign hepatic adenomas are associated with combined oral contraceptive use, although the incidence of benign tumors is rare in the United States. Rupture of benign, hepatic adenomas may cause death through intra-abdominal hemorrhage.


Studies have shown an increased risk of developing hepatocellular carcinoma in combined oral contraceptive users. However, these cancers are rare in the U.S. There is insufficient data to determine whether POPs increase the risk of developing hepatic neoplasia.



Precautions



1. General


Patients should be counseled that this product does not protect against HIV infection (AIDS) and other sexually transmitted diseases.



2. Physical Examination and Follow Up


It is considered good medical practice for sexually active women using oral contraceptives to have annual history and physical examinations. The physical examination may be deferred until after initiation of oral contraceptives if requested by the woman and judged appropriate by the healthcare professional.



3. Carbohydrate and Lipid Metabolism


Some users may experience slight deterioration in glucose tolerance, with increases in plasma insulin but women with diabetes mellitus who use progestin-only oral contraceptives do not generally experience changes in their insulin requirements. Nonetheless, prediabetic and diabetic women in particular should be carefully monitored while taking POPs.


Lipid metabolism is occasionally affected in that HDL, HDL2, and apolipoprotein A-I and A-II may be decreased; hepatic lipase may be increased. There is usually no effect on total cholesterol, HDL3, LDL, or VLDL.



4. Drug Interactions


The effectiveness of progestin-only pills is reduced by hepatic enzyme-inducing drugs such as the anticonvulsants phenytoin, carbamazepine, and barbiturates, and the antituberculosis drug rifampin. No significant interaction has been found with broad-spectrum antibiotics.



5. Interactions with Laboratory Tests


The following endocrine tests may be affected by progestin-only oral contraceptive use:


  • Sex hormone-binding globulin (SHBG) concentrations may be decreased.

  • Thyroxine concentrations may be decreased, due to a decrease in thyroid binding globulin (TBG).


6. Carcinogenesis


See WARNINGS section.



7. Pregnancy


Many studies have found no effects on fetal development associated with long-term use of contraceptive doses of oral progestins. The few studies of infant growth and development that have been conducted have not demonstrated significant adverse effects. It is nonetheless prudent to rule out suspected pregnancy before initiating any hormonal contraceptive use.



8. Nursing Mothers


In general, no adverse effects have been found on breastfeeding performance or on the health, growth, or development of the infant. However, isolated post-marketing cases of decreased milk production have been reported. Small amounts of progestins pass into the breast milk of nursing mothers, resulting in detectable steroid levels in infant plasma.



9. Pediatric Use


Safety and efficacy of norethindrone  tablets have been established in women of reproductive age. Safety and efficacy are expected to be the same for postpubertal adolescents under the age of 16 and for users 16 years and older. Use of this product before menarche is not indicated.



10. Fertility Following Discontinuation


The limited available data indicate a rapid return of normal ovulation and fertility following discontinuation of progestin-only oral contraceptives.



11. Headache


The onset or exacerbation of migraine or development of severe headache with focal neurological symptoms which is recurrent or persistent requires discontinuation of progestin-only contraceptives and evaluation of the cause.



INFORMATION FOR THE PATIENT


1. See “DETAILED PATIENT LABELING” for detailed information.


2. Counseling Issues


The following points should be discussed with prospective users before prescribing progestin-only oral contraceptives:


  • The necessity of taking pills at the same time every day, including throughout all bleeding episodes.

  • The need to use a backup method such as condoms and spermicides for the next 48 hours whenever a progestin-only oral contraceptive is taken 3 or more hours late.

  • The potential side effects of progestin-only oral contraceptives, particularly menstrual irregularities.

  • The need to inform the healthcare professional of prolonged episodes of bleeding, amenorrhea or severe abdominal pain.

  • The importance of using a barrier method in addition to progestin-only oral contraceptives if a woman is at risk of contracting or transmitting STDs/HIV.


Adverse Reactions


Adverse reactions reported with the use of POPs include:


  • Menstrual irregularity is the most frequently reported side effect.

  • Frequent and irregular bleeding are common, while long duration of bleeding episodes and amenorrhea are less likely.

  • Headache, breast tenderness, nausea, and dizziness are increased among progestin-only oral contraceptive users in some studies.

  • Androgenic side effects such as acne, hirsutism, and weight gain occur rarely.


Overdosage


There have been no reports of serious ill effects from overdosage, including ingestion by children.



Errin Dosage and Administration


To achieve maximum contraceptive effectiveness, norethindrone tablets must be taken exactly as directed. One tablet is taken every day, at the same time. Administration is continuous, with no interruption between pill packs. See DETAILED PATIENT LABELING for detailed instruction.



How is Errin Supplied


Errin® (norethindrone tablets, USP 0.35 mg) are packaged in cartons of six blister cards each containing 28 tablets. Each yellow, round, flat-faced, beveled-edge, unscored tablet is debossed with stylized b on one side and 344 on the other side.


Store at 20° to 25°C (68° to 77°F) [See USP Controlled Room Temperature].


KEEP THIS AND ALL MEDICATIONS OUT OF THE REACH OF CHILDREN.



 REFERENCE


McCann M, and Potter L. Progestin-Only Oral Contraceptives: A Comprehensive Review. Contraception, 50:60 (Suppl. 1), December 1994.


Truitt ST, Fraser A, Gallo ME, Lopez LM, Grimes DA and Schulz KF. Combined hormonal versus nonhormonal versus progestin-only contraception in lactation (Review). The Cochrane Collaboration. 2007, Issue 3.


Halderman, LD and Nelson AL. Impact of early postpartum administration of progestin-only hormonal contraceptives compared with nonhormonal contraceptives on short-term breastfeeding patterns. Am J Obstet Gynecol.; 186 (6):1250-1258.


Ostrea EM, Mantaring III JB, Silvestre MA. Drugs that affect the fetus and newborn infant via the placenta or breast milk. Pediatr Clin N Am; 51(2004): 539-579.


Cooke ID, Back DJ, Shroff NE: Norethisterone concentration in breast milk and infant and maternal plasma during ethynodiol diactetate administration. Contraception 1985; 31:611-21.



DETAILED PATIENT LABELING


This product (like all oral contraceptives) is used to prevent pregnancy.It does not protect against HIV infection (AIDS) and other sexually transmitted diseases.


DESCRIPTION


Norethindrone Tablet 28 Day Regimen


Each yellow tablet contains 0.35 mg norethindrone. Inactive ingredients include anhydrous lactose, corn starch, D&C yellow no. 10 aluminum lake, ethylcellulose aqueous dispersion, lactose monohydrate, magnesium stearate, microcrystalline cellulose and povidone.


INTRODUCTION


This leaflet is about birth control pills that contain one hormone, a progestin. Please read this leaflet before you begin to take your pills. It is meant to be used along with talking with your healthcare professional.


Progestin-only pills are often called “POPs” or “the minipill”. POPs have less progestin than the combined birth control pill (or “the pill”) which contains both an estrogen and a progestin.


HOW EFFECTIVE ARE POPs?


About 1 in 200 POP users will get pregnant in the first year if they all take POPs perfectly (that is, on time, every day). About 1 in 20 “typical” POP users (including women who are late taking pills or miss pills) gets pregnant in the first year of use. Table 2 will help you compare the efficacy of different methods.



































































































































Table 2: Percentage of Women Experiencing an Unintended Pregnancy During the First Year of Typical Use and the First Year of Perfect Use of Contraception and the Percentage Continuing Use at the End of the First Year. United States.
% of Women Experiencing an Unintended Pregnancy within the First Year of Use% of Women Continuing Use at One Year3
Method (1)Typical Use1 (2)Perfect Use2 (3)(4)
Chance48585
Spermicides526640
Periodic abstinence2563
Calendar9
Ovulation Method3
Sympto-Thermal62
Post-Ovulation1
Cap7
Parous Women402642
Nulliparous Women20956
Sponge
Parous Women402042
Nulliparous Women20956
Diaphragm720656
Withdrawal194
Condom8
Female (Reality®)21556
Male14361
Pill571
Progestin Only0.5
Combined0.1
IUD
Progesterone T21.581
Copper T380A0.80.678
LNg 200.10.181
Depo-Provera®0.30.370
Norplant® and0.050.0588
Norplant-2®
Female Sterilization0.50.5100
Male Sterilization0.150.10100

Adapted from Hatcher et al, 1998, Ref. # 1.


Emergency Contraceptive Pills: Treatment initiated within 72 hours after unprotected intercourse reduces the risk of pregnancy by at least 75%.9


Lactational Amenorrhea Method: LAM is highly effective, temporary method of contraception.10


Source: Trussell J, Contraceptive efficacy. In Hatcher RA, Trussell J, Stewart F, Cates W, Stewart GK, Kowal D, Guest F, Contraceptive Technology: Seventeenth Revised Edition. New York NY: Irvington Publishers, 1998.


1 Among typical couples who initiate use of a method (not necessarily for the first time), the percentage who experience an accidental pregnancy during the first year if they do not stop use for any other reason.


2 Among couples who initiate use of a method (not necessarily for the first time) and who use it perfectly (both consistently and correctly), the percentage who experience an accidental pregnancy during the first year if they do not stop use for any other reason.


3 Among couples attempting to avoid pregnancy, the percentage who continue to use a method for one year.


4 The percents becoming pregnant in columns (2) and (3) are based on data from populations where contraception is not used and from women who cease using contraception in order to become pregnant. Among such populations, about 89% become pregnant within one year. This estimate was lowered slightly (to 85%) to represent the percent who would become pregnant within one year among women now relying on reversible methods of contraception if they abandoned contraception altogether.


5 Foams, creams, gels, vaginal suppositories, and vaginal film.


6 Cervical mucus (ovulation) method supplemented by calendar in the pre-ovulatory and basal body temperature in the post-ovulatory phases.


7 With spermicidal cream or jelly.


8 Without spermicides.


9 The treatment schedule is one dose within 72 hours after unprotected intercourse, and a second dose 12 hours after the first dose. The Food and Drug Administration has declared the following brands of oral contraceptives to be safe and effective for emergency contraception: Ovral® (1 dose is 2 white pills), Alesse® (1 dose is 5 pink pills), Nordette® or Levlen® (1 dose is 2 light-orange pills), Lo/Ovral® (1 dose is 4 white pills), Triphasil® or Tri-Levlen® (1 dose is 4 yellow pills).


10 However, to maintain effective protection against pregnancy, another method of contraception must be used as soon as menstruation resumes, the frequency or duration of breastfeeds is reduced, bottle feeds are introduced, or the baby reaches six months of age.


Norethindrone Tablets have not been studied for and are not indicated for use in emergency contraception.


HOW DO POPs WORK?


POPs can prevent pregnancy in different ways including:


  • They make the cervical mucus at the entrance to the womb (the uterus) too thick for the sperm to get through to the egg.

  • They prevent ovulation (release of the egg from the ovary) in about half of the cycles.

  • They also affect other hormones, the fallopian tubes and the lining of the uterus.

YOU SHOULD NOT TAKE POPs


  • If there is any chance you may be pregnant.

  • If you have breast cancer.

  • If you have bleeding between your periods that has not been diagnosed.

  • If you are taking certain drugs for epilepsy (seizures) or for TB. (See “USING POPs WITH OTHER MEDICINES” below.)

  • If you are hypersensitive, or allergic, to any component of this product.

  • If you have liver tumors, either benign or cancerous.

  • If you have acute liver disease.

RISKS OF TAKING POPs


Cigarette smoking greatly increases the possibility of suffering heart attacks and strokes. Women who use oral contraceptives are strongly advised not to smoke.


WARNING


If you have sudden or severe pain in your lower abdomen or stomach area, you may have an ectopic pregnancy or an ovarian cyst. If this happens, you should contact your healthcare professional immediately.


Ectopic Pregnancy


An ectopic pregnancy is a pregnancy outside the womb. Because POPs protect against pregnancy, the chance of having a pregnancy outside the womb is very low. If you do get pregnant while taking POPs, you have a slightly higher chance that the pregnancy will be ectopic than do users of some other birth control methods.


Ovarian Cysts


These cysts are small sacs of fluid in the ovary. They are more common among POP users than among users of most other birth control methods. They usually disappear without treatment and rarely cause problems.


Cancer of the Reproductive Organs and Breasts


Some studies in women who use combined oral contraceptives that contain both estrogen and a progestin have reported an increase in the risk of developing breast cancer, particularly at a younger age and apparently related to duration of use. There is insufficient data to determine whether the use of POPs similarly increases this risk.


A meta-analysis of 54 studies found a small increase in the frequency of having breast cancer diagnosed for women who were currently using combined oral contraceptives or had used them within the past ten years. This increase in the frequency of breast cancer diagnosis, within ten years of stopping use, was generally accounted for by cancers localized to the breast. There was no increase in the frequency of having breast cancer diagnosed ten or more years after cessation of use.


Some studies have found an increase in the incidence of cancer of the cervix in women who use oral contraceptives. However, this finding may be related to factors other than the use of oral contraceptives and there is insufficient data to determine whether the use of POPs increases the risk of developing cancer of the cervix.


Liver Tumors


In rare cases, combined oral contraceptives can cause benign but dangerous liver tumors. These benign liver tumors can rupture and cause fatal internal bleeding. In addition, some studies report an increased risk of developing liver cancer among women who use combined oral contraceptives. However, liver cancers are rare. There is insufficient data to determine whether POPs increase the risk of liver tumors.


Diabetic Women


Diabetic women taking POPs do not generally require changes in the amount of insulin they are taking. However, your healthcare professional may monitor you more closely under these conditions.


SEXUALLY TRANSMITTED DISEASES (STDs)


WARNING: POPs do not protect against getting or giving someone HIV (AIDS) orany other STD, such as chlamydia, gonorrhea, genital warts or herpes.


SIDE EFFECTS


Irregular Bleeding


The most common side effect of POPs is a change in menstrual bleeding. Your periods may be either early or late, and you may have some spotting between periods. Taking pills late or missing pills can result in some spotting or bleeding.


Other Side Effects


Less common side effects include headaches, tender breasts, nausea and dizziness. Weight gain, acne and extra hair on your face and body have been reported, but are rare.


If you are concerned about any of these side effects, check with your healthcare professional.


Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


USING POPs WITH OTHER MEDICINES


Before taking a POP, inform your healthcare professional of any other medication, including over-the-counter medicine, that you may be taking.


These medicines can make POPs less effective:


Medicines for seizures such as:


  • Phenytoin (Dilantin®)

  • Carbamazepine (Tegretol)

  • Phenobarbital

Medicine for TB:


  • Rifampin (Rifampicin)

Before you begin taking any new medicines be sure your healthcare professional knows you are taking a progestin-only birth control pill.


HOW TO TAKE POPs


IMPORTANT POINTS TO REMEMBER


  • POPs must be taken at the same time every day, so choose a time and then take the pill at that same time every day. Every time you take a pill late, and especially if you miss a pill, you are more likely to get pregnant.

  • Start the next pack the day after the last pack is finished. There is no break between packs. Always have your next pack of pills ready.

  • You may have some menstrual spotting between periods. Do not stop taking your pills if this happens.

  • If you vomit soon after taking a pill, use a backup method (such as a condom and/or a spermicide) for 48 hours.

  • If you want to stop taking POPs, you can do so at anytime, but, if you remain sexually active and don't wish to become pregnant, be certain to use another birth control method.

  • If you are not sure about how to take POPs, ask your healthcare professional.

STARTING POPs


  • It's best to take your first POP on the first day of your menstrual period.

  • If you decide to take your first POP on another day, use a backup method (such as a condom and/or a spermicide) every time you have sex during the next 48 hours.

  • If you have had a miscarriage or an abortion, you can start POPs the next day.

IF YOU ARE LATE OR MISS TAKING YOUR POPs


  • If you are more than 3 hours late or you miss one or more POPs:

1) TAKE a missed pill as soon as you remember that you missed it,


2) THEN go back to taking POPs at your regular time,


3) BUT be sure to use a backup method (such as a condom and/or a spermicide) every time you have sex for the next 48 hours.


  • If you are not sure what to do about the pills you have missed, keep taking POPs and use a backup method until you can talk to your healthcare professional.

IF YOU ARE BREASTFEEDING


  • If you are fully breastfeeding (not giving your baby any food or formula), you may start your pills 6 weeks after delivery.

  • If you are partially breastfeeding (giving your baby some food or formula), you should start taking pills by 3 weeks after delivery.

IF YOU ARE SWITCHING PILLS


  • If you are switching from the combined pills to POPs, take the first POP the day after you finish the last active combined pill. Do not take any of the 7 inactive pills from the combined pill pack. You should know that many women have irregular periods after switching to POPs, but this is normal and to be expected.

Efavirenz


Class: Nonnucleoside Reverse Transcriptase Inhibitors
VA Class: AM800
Chemical Name: (±) - 6 - Chloro - 4 - (cyclopropylethynyl) - 1,4 - dihydro - 4 - (trifluoromethyl) - 2H - 3,1 - benzoxazin - 2 - one
Molecular Formula: C14H9ClF3NO2
CAS Number: 154635-17-3
Brands: Atripla, Sustiva

Introduction

Antiretroviral; nonnucleoside reverse transcriptase inhibitor (NNRTI).1 2 3 12 14


Uses for Efavirenz


Treatment of HIV Infection


Treatment of HIV-1 infection in conjunction with other antiretrovirals.1


The preferred NNRTI for initial treatment regimens, except during first trimester of pregnancy or in women of childbearing age who may become pregnant.37 52 53 (See Fetal/Neonatal Morbidity and Mortality under Cautions.)


Fixed-combination preparation containing efavirenz, emtricitabine, and tenofovir (Atripla) used alone or in conjunction with other antiretrovirals.78 Used to decrease pill burden and improve compliance.78


Postexposure Prophylaxis of HIV


Postexposure prophylaxis of HIV infection in health-care workers and others exposed occupationally via percutaneous injury or mucous membrane or nonintact skin contact with blood, tissues, or other body fluids associated with risk for transmission of the virus.72 Used in conjunction with other antiretrovirals.72


Postexposure prophylaxis of HIV infection following nonoccupational exposure to blood, genital secretions, or other potentially infectious body fluids of a person known to be infected with HIV when such exposure represents a substantial risk for HIV transmission.74 Used in conjunction with other antiretrovirals.74


Efavirenz Dosage and Administration


Administration


Oral Administration


Administer single-entity preparation (Sustiva) or fixed-combination preparation (Atripla) orally once daily on an empty stomach, preferably at bedtime.1 37 78


Administration at bedtime may make adverse CNS effects (dizziness, insomnia, impaired concentration, somnolence, abnormal dreams) more tolerable.1 35 44


If used in individuals who cannot swallow capsules or tablets, the capsules (Sustiva) may be opened and added to liquids or foods;44 efavirenz has a peppery taste that may be disguised by administering with grape jelly.44 Do not break the tablets.1


Because the dosage of efavirenz, emtricitabine, and tenofovir cannot be adjusted individually, the fixed combination containing efavirenz, emtricitabine, and tenofovir (Atripla) should not be used in patients with moderate to severe renal impairment (Clcr <50 mL/minute).78


Dosage


Administer single-entity preparation (Sustiva) in conjunction with other antiretrovirals.1


The fixed-combination preparation containing efavirenz, emtricitabine, and tenofovir (Atripla) may be used alone or in conjunction with other antiretrovirals.78


If used in conjunction with atazanavir, fosamprenavir, indinavir, or lopinavir, adjustment in the treatment regimen necessary. (See Specific Drugs under Interactions.)


If used concomitantly with voriconazole, dosage adjustment for both drugs is needed.1


Dosage of Atripla expressed as number of tablets.78


Pediatric Patients


Treatment of HIV Infection

Oral
















Dosage in Children ≥3 Years of Age1

Weight in kg



Dosage



10 to <15



200 mg once daily



15 to <20



250 mg once daily



20 to <25



300 mg once daily



25 to <32.5



350 mg once daily



32.5 to <40



400 mg once daily



≥40



600 mg once daily


Adults


Treatment of HIV Infection

Oral

600 mg once daily.1 37


If used with voriconazole: Efavirenz 300 mg once daily (as capsules; do not divide tablets) and voriconazole 400 mg every 12 hours.1


Atripla: 1 tablet once daily.78


Postexposure Prophylaxis of HIV

Occupational Exposure

Oral

600 mg once daily.72


Initiate postexposure prophylaxis as soon as possible following exposure (within hours rather than days) and continue for 4 weeks, if tolerated.72


Nonoccupational Exposure

Oral

600 mg once daily.74


Initiate postexposure prophylaxis as soon as possible following exposure (preferably ≤72 hours after exposure) and continue for 28 days.74


Special Populations


Renal Impairment


Dosage adjustments not necessary.37


Atripla: Dosage adjustment not necessary in patients with Clcr ≥50 mL/minute.78 Not recommended in patients with Clcr <50 mL/minute.78


Geriatric Patients


Select dosage with caution because of age-related decreases in hepatic, renal, and/or cardiac function and concomitant disease and drug therapy.1


Cautions for Efavirenz


Contraindications



  • History of clinically important hypersensitivity reaction (e.g., Stevens-Johnson syndrome, erythema multiforme, toxic skin eruption) to efavirenz or any ingredient in the formulation.1




  • Concomitant use with drugs for which elevated plasma concentrations are associated with serious and/or life-threatening events (e.g., cisapride, ergot alkaloids, midazolam, pimozide, triazolam).1 (See Specific Drugs under Interactions.)




  • Concomitant use with drugs when such use may result in decreased plasma concentrations of efavirenz, possible loss of virologic response, and development of resistance (e.g., St. John’s wort [Hypericum perforatum]).1 (See Specific Drugs under Interactions.)



Warnings/Precautions


Warnings


Interactions

Serious and/or life-threatening drug interactions, clinically important drug interactions, or loss of virologic effect can occur with some drugs.1 (See Specific Drugs under Interactions.)


Psychiatric Symptoms

Serious adverse psychiatric symptoms (severe depression, suicidal ideation, nonfatal suicide attempts, aggressive behavior, paranoid reactions) reported rarely in clinical studies.1 Factors associated with increased occurrence of psychiatric symptoms include history of drug use (injection), history of psychiatric disorders, and treatment with an antipsychotic drug at study entry.1


Use with caution in patients with unstable psychiatric disease.37


Patients experiencing serious psychiatric adverse events should be evaluated to determine if symptoms are related to efavirenz, and if so, a determination should be made whether the risks of continued therapy outweigh the benefits.1


Nervous System Effects

Dizziness or insomnia reported frequently; abnormal dreams, hallucinations, or impaired concentration also reported.1 These adverse effects generally begin during the first 1–2 days of therapy, improve with continued therapy, and usually resolve after the first 2–4 weeks.1 35


Seizures reported rarely.1 Generally has occurred in patients with a history of seizures; caution advised in these patients.1 Patients receiving anticonvulsant therapy may require periodic monitoring.1 (See Specific Drugs under Interactions.)


Fetal/Neonatal Morbidity and Mortality

May cause fetal harm. Teratogenicity demonstrated in animals. Birth defects (including neural tube defects) reported in humans, usually after first-trimester exposure.1


Pregnancy should be avoided.1 Women of childbearing potential should undergo a pregnancy test prior to initiating therapy.1 In addition, women of childbearing potential should use 2 forms of contraception (i.e., barrier contraceptive and hormonal contraceptive).1


Sensitivity Reactions


Dermatologic Reactions

Rash (maculopapular skin eruptions) reported frequently; rash associated with blistering, moist desquamation, or ulceration, erythema multiforme, and Stevens-Johnson Syndrome also reported.1 2 35 Median time to onset 11 days; median duration 16 days.1


Discontinue efavirenz in patients who develop severe rash associated with blistering, desquamation, mucosal involvement, or fever.1 Efavirenz Can be reinitiated after interruption for rash.1 Antihistamines and/or corticosteroids may improve tolerability and hasten resolution of rash.1


General Precautions


Do not use multiple efavirenz-containing preparations concomitantly.1


Use of Fixed Combinations

When used in fixed combination with tenofovir and emtricitabine (Atripla), consider the cautions, precautions, and contraindications associated with the concomitant agents.78


Lipid Effects

Increases in total serum cholesterol have occurred.1 Monitor serum triglycerides and cholesterol concentrations.1


Adipogenic Effects

Possible redistribution or accumulation of body fat, including central obesity, dorsocervical fat enlargement (“buffalo hump”), peripheral wasting, breast enlargement, and general cushingoid appearance.1


Immune Reconstitution Syndrome

During initial treatment, patients who respond to antiretroviral therapy may develop an inflammatory response to indolent or residual opportunistic infections (e.g., Mycobacterium avium complex [MAC], M. tuberculosis, cytomegalovirus [CMV], Pneumocystis jiroveci [formerly P. carinii]); this may necessitate further evaluation and treatment.1


Specific Populations


Pregnancy

Category D.1


Antiretroviral Pregnancy Registry at 800-258-4263.1 Women of childbearing potential should use effective contraceptive measures while receiving efavirenz.1 (See Fetal/Neonatal Morbidity and Mortality under Cautions.)


Avoid use during first trimester of pregnancy and in women of childbearing age who may become pregnant (e.g., those who desire to become pregnant or who do not use effective and consistent contraception).37 69 Some experts state use can be considered after the first trimester in special circumstances.69


Lactation

Distributed into milk in rats; not known whether distributed into human milk.1


Instruct HIV-infected women not to breast-feed because of risk of HIV transmission and risk of adverse effects in the infant.1 69


Pediatric Use

Sustiva: Safety and efficacy not evaluated in neonates and children <3 years of age or who weigh <13 kg.1


Adverse effects in children 3–16 years of age are similar to those reported in adults with the exception of rash.1 Rash reported more frequently in children than adults and the incidence of moderate to severe rash has been greater in children than adults.1


Atripla: Safety and efficacy not established in pediatric patients <18 years of age.78


Geriatric Use

Insufficient experience in those ≥65 years of age to determine whether they respond differently than younger adults.1


Select dosage with caution because of age-related decreases in hepatic, renal, and/or cardiac function and concomitant disease and drug therapy.1


Hepatic Impairment

Use with caution in patients with hepatic impairment.1


Monitor hepatic enzyme concentrations in patients with known or suspected hepatitis B virus (HBV) infection or hepatitis C virus (HCV) infection and in patients receiving other drugs associated with hepatotoxicity.1


The benefits of continued efavirenz therapy versus the risks of hepatotoxicity should be considered in patients with serum hepatic enzyme concentrations >5 times the ULN.1


Common Adverse Effects


Rash, dizziness, nausea, headache, fatigue, insomnia, vomiting.1


Interactions for Efavirenz


Metabolized by CYP3A and CYP2B6.1


Inhibits CYP2C9, CYP2C19, and CYP3A4, and to a lesser extent, CYP2D6 and CYP1A2.1 Does not inhibit CYP2E1.1


Induces CYP3A.1


Drugs Affecting or Metabolized by Hepatic Microsomal Enzymes


Pharmacokinetic interactions likely with drugs that are inhibitors, inducers, or substrates of CYP3A, CYP29C, or CYP2C19 with possible alteration in metabolism of efavirenz and/or other drug.1


Specific Drugs
























































































































Drug



Interaction



Comments



Abacavir



In vitro evidence of additive antiretroviral effects1



Alcohol



Potential for additive CNS effects1



Antacids (aluminum hydroxide, magnesium hydroxide, simethicone)



Pharmacokinetic interaction unlikely1



Dosage adjustment not needed1



Anticoagulants, oral



Warfarin concentrations likely to be affected1



Use with caution; monitor INR1 37



Anticonvulsants (carbamazepine, phenobarbital, phenytoin)



Carbamazepine: Decreased concentration of efavirenz and carbamazepine1


Possible decreased concentrations of phenobarbital and phenytoin and/or efavirenz 1 37



Use with caution; monitor anticonvulsant concentrations;1 37 insufficient information to make dosage recommendation with carbamazepine;1 consider alternative anticonvulsant37



Antifungals, azoles (fluconazole, itraconazole, ketoconazole, voriconazole)



Fluconazole: No clinically important pharmacokinetic interactions1 37 55


Itraconazole: Decreased concentrations of itraconazole; no change in efavirenz concentrations1


Ketoconazole: Possible decreased concentrations of the antifungal1


Posaconazole: Decreased concentrations of posaconazole37


Voriconazole: Decreased voriconazole concentrations; increased efavirenz concentrations1 37



Fluconazole: Dosage adjustment not needed1 55


Itraconazole: Dosage recommendation for concomitant use not available; consider alternative antifungal;1 some experts suggest dosage adjustment for itraconazole. If used concomitantly, monitor plasma concentrations of itraconazole37


Posaconazole: Consider alternative antifungal or monitor plasma concentrations of the antifungal37


Voriconazole: Concomitant use of usual dosages of voriconazole and efavirenz contraindicated;1 37 if used with voriconazole, manufacturer of efavirenz recommends increasing voriconazole maintenance dosage to 400 mg every 12 hours and decreasing efavirenz dosage to 300 mg (use capsules; do not divide tablet) once daily1



Antihistamines



Decreased cetirizine concentrations; no change in efavirenz concentrations1



When used with cetirizine, dosage adjustment not needed1



Antimycobacterials (rifabutin, rifampin, rifapentine)



Rifabutin: Decreased rifabutin concentrations; no change in efavirenz AUC1 37 54 55


Rifampin: Decreased efavirenz concentrations1 37



Rifabutin: Efavirenz dosage adjustment not needed; increase rifabutin dosage to 450–600 mg once daily or 600 mg 3 times weekly provided regimen does not include an HIV protease inhibitor1 37


Rifampin: Efavirenz 600 mg once daily for patients weighing <60 kg or consider using efavirenz 800 mg once daily37


Rifapentine: Concomitant use not recommended37



Atazanavir



Decreased atazanavir concentrations and AUC;37 73 no change in efavirenz concentrations37



In treatment-naive adults, a regimen of atazanavir 400 mg, ritonavir 100 mg (with food), and efavirenz 600 mg given once daily (without food) is recommended37 73


Concomitant use not recommended in treatment-experienced adults37 73


Do not use atazanavir concomitantly with efavirenz unless low-dose ritonavir also is given73



Benzodiazepines



Pharmacokinetic interaction with midazolam or triazolam; potential for prolonged or increased sedation or respiratory depression1


Increased lorazepam concentrations and AUC1



Concomitant use with midazolam or triazolam contraindicated;1 some experts state a single parenteral dose of midazolam can be used with caution in a monitored situation for procedural sedation37


When used with lorazepam, dosage adjustment not needed1



Calcium-channel blocking agents



Diltiazem: Decrease diltiazem concentrations; slightly increased efavirenz concentrations1


Possible decreased concentrations of other calcium-channel blocking agents that are substrates of CYP 3A4 (e.g., felodipine, nicardipine, nifedipine, verapamil)1



Diltiazem: Adjust diltiazem dosage according to clinical response; no dosage adjustment needed for efavirenz1


Calcium-channel blocking agents that are substrates of CYP 3A4: Adjust dosage according to clinical response1



Cisapride



Pharmacokinetic interaction; potential for serious or life-threatening reactions (e.g., cardiac arrhythmias)1



Concomitant use contraindicated1 37



Darunavir



Increased efavirenz concentrations; decreased darunavir concentrations37 80



Clinical importance unknown;37 80 caution advised;80 use standard dosages and consider monitoring plasma concentrations37



Delavirdine



Not studied1



Concomitant use of NNRTIs not recommended37



Didanosine



In vitro evidence of additive antiretroviral effects1



Emtricitabine



In vitro evidence of additive or synergistic antiretroviral effects1 84



Enfuvirtide



In vitro evidence of additive antiretroviral effects1



Ergot alkaloids (dihydroergotamine, ergonovine, ergotamine, methylergonovine)



Possibility of pharmacokinetic interaction; potential for serious or life-threatening reactions (e.g., acute ergot toxicity)1



Concomitant use contraindicated1 37


If treatment of uterine atony and excessive postpartum bleeding is indicated in a woman receiving efavirenz, use methylergonovine maleate (Methergine) only if alternative treatments cannot be used and if potential benefits outweigh risks; use methylergonovine at lowest dosage and shortest duration possible69



Estrogens/Progestins



Hormonal contraceptives: Increased AUC of ethinyl estradiol; no change in efavirenz concentrations with oral contraceptive preparations1 42 55



Hormonal contraceptives: Use a barrier contraceptive as an alternative to or in addition to a hormonal contraceptive1 37



Etravirine



Decreased etravirine concentrations37 86



Concomitant use of NNRTIs not recommended37 86



Fosamprenavir



Substantially decreased amprenavir concentrations if used with fosamprenavir; additional pharmacokinetic interactions if fosamprenavir used with both ritonavir and efavirenz37 82



If fosamprenavir used with efavirenz, boosting with ritonavir required 37 82


When efavirenz is used with ritonavir-boosted fosamprenavir, fosamprenavir 1.4 g once daily with ritonavir 300 mg once daily or fosamprenavir 700 mg twice daily with ritonavir 100 mg twice daily recommended; efavirenz dosage adjustment not needed37



Histamine H2-receptor antagonists (famotidine)



Pharmacokinetic interaction unlikely with famotidine1



When used with famotidine, dosage adjustment not needed1



HMG-CoA reductase inhibitors



Decreased AUC of atorvastatin, pravastatin, and simvastatin1 37



Individualize dosage of antilipemic agent;1 if used with atorvastatin, pravastatin, or simvastatin, adjust dosage of antilipemic agent according to lipid response (up to maximum dosage)37



Indinavir



Decreased peak plasma concentrations and AUC of indinavir; no change in pharmacokinetics of efavirenz1 33 37


In vitro evidence of additive antiretroviral effects1



Adjustment of efavirenz dosage not needed; increase indinavir dosage to 1 g every 8 hours or consider ritonavir-boosted indinavir1 37



Lamivudine



Pharmacokinetic interaction unlikely1


In vitro evidence of additive antiretroviral effects1



Dosage adjustment not needed1



Lopinavir



Lopinavir 600 mg and ritonavir 150 mg twice daily with efavirenz 600 mg once daily: Increased lopinavir concentrations relative to lopinavir 400 mg and ritonavir 100 mg twice daily (without efavirenz)1 70


In vitro evidence of additive antiretroviral effects1



Once-daily lopinavir regimen not recommended with efavirenz1 70


For adults, manufacturer of lopinavir recommends 500 mg of lopinavir and 125 mg of ritonavir (as tablets) twice daily70


Manufacturer of lopinavir recommends that adults receive 533 mg of lopinavir and 133 mg of ritonavir (6.7 mL of the oral solution) twice daily70


For pediatric patients 6 months to 18 years of age, manufacturer of lopinavir recommends that children receive 300 mg/m2 of lopinavir and 75 mg/m2 of ritonavir twice daily (do not exceed the adult dosage)70



Macrolides (azithromycin, clarithromycin, erythromycin)



Clarithromycin: Decreased clarithromycin concentrations and increased 14-hydroxyclarithromycin concentrations;1 rash reported with concomitant administration1


Azithromycin: Pharmacokinetic interaction unlikely1


Erythromycin: Not studied1



Clarithromycin: Monitor for efficacy of the macrolide or use an alternative anti-infective1 37


Azithromycin: Dosage adjustment not needed1



Maraviroc



Decreased maraviroc concentrations37 85



If used concomitantly, recommended dosage of maraviroc is 600 mg twice daily37 85



Nelfinavir



Increased peak plasma concentrations and AUC of nelfinavir; decreased peak plasma concentrations and AUC of nelfinavir metabolite (M8); no change in pharmacokinetics of efavirenz1 37 38 43


In vitro evidence of additive antiretroviral effects1



Dosage adjustments not needed1 33 37 38



Nevirapine



Decreased efavirenz AUC;23 37 no change in nevirapine concentrations37



Concomitant use of NNRTIs not recommended37



Psychotherapeutic agents



Potential for additive CNS effects1 1


Paroxetine: Pharmacokinetic interaction unlikely1


Sertraline: Decreased sertraline concentrations1


Pimozide: Potential for serious or life-threatening reactions (e.g., cardiac arrhythmias)1



Paroxetine: Dosage adjustment not needed1


Sertraline: Increases in sertraline dosage should be guided by clinical response1


Pimozide: Concomitant use contraindicated1



Ritonavir



Increased ritonavir AUC and increased efavirenz AUC1 37 40


Higher incidence of dizziness, nausea, paresthesia, and elevated hepatic enzyme values with regimens that include both drugs1 44


In vitro evidence of additive antiretroviral effects1



Monitor hepatic enzymes;1 44 use usual dosages37



Saquinavir



Decreased peak plasma concentrations and AUC of saquinavir;1 33 37 decreased efavirenz concentrations37


Concomitant use with ritonavir-boosted saquinavir not evaluated83


In vitro evidence of additive antiretroviral effects1



Some clinicians recommend using saquinavir 1 g twice daily and ritonavir 100 mg twice daily with usual dosage of efavirenz37



St. John’s wort (Hypericum perforatum)



Decreased efavirenz concentrations; possible loss of virologic response and increased risk of efavirenz resistance1 63 64



Concomitant use contraindicated1 37



Tenofovir



No evidence of pharmacokinetic interaction76


In vitro evidence of additive or synergistic antiretroviral effects1



Dosage adjustment not needed1



Tipranavir



Tipranavir 500 mg twice daily and ritonavir 100 mg twice daily and efavirenz 600 mg once daily: Decreased tipranavir concentrations and no change in efavirenz concentrations37 77


In vitro evidence of additive antiretroviral effects77



Some experts state that dosage adjustment not necessary37



Valproic acid



No evidence of pharmacokinetic interaction75



Zidovudine



Pharmacokinetic interaction unlikely1


In vitro evidence of additive antiretroviral effects1



Dosage adjustment not necessary1


Efavirenz Pharmacokinetics


Absorption


Bioavailability


Peak plasma concentrations attained within 3–5 hours.1


The fixed-combination tablet containing efavirenz 600 mg, tenofovir disoproxil fumarate 300 mg, and emtricitabine 200 mg (Atripla) is bioequivalent to a 600-mg efavirenz tablet, a 300-mg tenofovir disoproxil fumarate tablet, and a 200-mg emtricitabine capsule given simultaneously.78


Food


Administration with food increases bioavailability.1


Compared with administration in the fasting state, AUC increased 22 or 17% when a single 600-mg dose as capsules was administered with a high-fat, high-calorie meal (894 kcal, 54 g fat, 54% calories from fat) or a reduced-fat normal calorie meal (440 kcal, 2 g fat, 4% calories from fat), respectively.1


Compared with administration in the fasting state, AUC increased 28% when a single 600-mg dose as tablets was administered with a high-fat, high-calorie meal (1000 kcal, 500–600 kcal from fat).1


Distribution


Extent


Not fully characterized.1


Low concentrations distributed into CSF.1


Not known whether efavirenz crosses the placenta. Distributed into milk in rats; not known whether distributed into human milk.1


Plasma Protein Binding


99.5–99.75%.1


Elimination


Metabolism


Metabolized by CYP3A and CYP2B6; undergoes subsequent glucuronidation.1


Elimination Route


16–61% excreted in feces (principally as unchanged drug) and 14–34% eliminated in urine as unchanged drug (<1%) or metabolites.1


Not removed by hemodialysis; probably not removed by peritoneal dialysis.1 67


Half-life


52–76 hours after a single dose and 50–55 hours after multiple doses.1


Stability


Storage


Oral


Capsules and Tablets

25°C (may be exposed to 15–30°C).1 78


Actions and SpectrumActions



  • Pharmacologically related to other NNRTIs (e.g., delavirdine, etravirine, nevirapine); differs structurally from these drugs; also differs pharmacologically and structurally from other currently available antiretrovirals.1 2 3 6 12 14 21 23 52 53




  • Active against HIV-1; inactive against HIV-2.1 3




  • Inhibits replication of HIV-1 by interfering with viral RNA- and DNA-directed polymerase activities of reverse transcriptase.1 3




  • HIV-1 with reduced susceptibility to efavirenz have been selected in vitro and have emerged during therapy with the drug.1 3 7 8 9 14 18




  • Strains of HIV-1 resistant to efavirenz may be cross-resistant to some other NNRTIs (i.e., delavirdine, nevirapine).1 3 7 8 9 10 19 23 32 37 44 50




  • Cross-resistance between efavirenz and NRTIs unlikely since the drugs bind at difference sites on reverse transcriptase and have difference mechanisms of action.1 3 7 8 9 10 32 Cross-resistance between efavirenz and PIs unlikely since the drugs have different target enzymes and mechanisms of action.1 32



Advice to Patients



  • Critical nature of compliance with HIV therapy.1 Importance of using efavirenz in conjunction with other antiretrovirals— not for monotherapy.1




  • Antiretroviral therapy is not a cure for HIV infection, and opportunistic infections still may occur.1 HIV transmission via sexual contact or sharing needles is not prevented by antiretrovirals.1




  • Importance of taking on a empty stomach.1




  • Potential for adverse CNS effects during the first weeks of therapy.1 Importance of taking efavirenz at bedtime.1 Use caution when driving or operating machinery until effects on individual known.1




  • Potential for serious psychiatric symptoms.1 Importance of seeking immediate medical evaluation if psychiatric symptoms occur.1




  • Risk of rash.1 Importance of contacting clinician if rash develops.1




  • Importance of reading patient package insert from manufacturer.1




  • Redistribution/accumulation of body fat may occur, with as yet unknown long-term health effects.1




  • Importance of informing clinicians of existing or contemplated concomitant therapy, including prescription and OTC drugs and dietary or herbal products.1




  • Importance of women informing clinicians if they are or plan to become pregnant or plan to breast-feed.1 Importance of advising women to avoid pregnancy.1




  • Importance of advising patients of other important precautionary information.1 (See Cautions.)



Preparations


Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.























Efavirenz

Routes



Dosage Forms



Strengths



Brand Names



Manufacturer



Oral



Capsules



50 mg



Sustiva



Bristol-Myers Squibb



200 mg



Sustiva



Bristol-Myers Squibb



Tablets, film-coated



600 mg



Sustiva



Bristol-Myers Squibb













Efavirenz Combinations

Routes



Dosage Forms



Strengths



Brand Names



Manufacturer



Oral



Tablets, film-coated



600 mg with Tenofovir Disoproxil Fumarate 300 mg and Emtricitabine 200 mg



Atripla



Bristol-Myers Squibb and Gilead


Comparative Pricing


This pricing information is subject to change at the sole discretion of DS Pharmacy. This pricing information was updated 04/2011. Actual costs to patients will vary depending on the use of specific retail or mail-order locations and health insurance copays.


Atripla 600-200-300MG Tablets (BRISTOL-MYERS SQUIBB/GILEAD): 30/$1795.72 or 90/$5154.14


Sustiva 200MG Capsules (B-M SQUIBB U.S. (PRIMARY CARE)): 90/$623.02 or 270/$1755.89


Sustiva 600MG Tablets (B-M SQUIBB U.S. (PRIMARY CARE)): 30/$623.02 or 90/$1757.88



Disclaimer

This report on medications is for your information only, and is not considered individual patient advice. Because of the changing nature of drug information, please consult your physician or pharmacist about specific clinical use.


The American Society of Health-System Pharmacists, Inc. and Drugs.com represent that the information provided hereunder was formulated with a reasonable standard of care, and in conformity with professional standards in the field. The American Society of Health-System Pharmacists, Inc. and Drugs.com make no representations or warranties, express or implied, including, but not limited to, any implied warranty of merchantability and/or fitness for a particular purpose, with respect to such information and specifically disclaims all such warranties. Users are advised that decisions regarding drug therapy are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and the information is provided for informational purposes only. The entire monograph for a drug should be reviewed for a thorough understanding of the drug's actions, uses and side effects. The American Society of Health-System Pharmacists, Inc. and Drugs.com do not endorse or recommend the use of any drug. The information is not a substitute for medical care.

AHFS Drug Information. © Copyright, 1959-2011, Selected Revisions November 01, 2009. American Society of Health-System Pharmacists, Inc., 7272 Wisconsin Avenue, Bethesda, Maryland 20814.


† Use is not currently included in the labeling approved by the US Food and Drug Administration.




References



1. Bristol-Myers Squibb Company. Sustiva (efavirenz) capsules and tablets prescribing information. Princeton, NJ; 2009 Mar.



2. Adkins JC, Noble S. Efavirenz. Drugs. 1998; 56:1055-64. [PubMed 9878993]



3. Young SD, Britcher SF, Tran LE et al. L-743,726 (DMP-266): a novel, highly potent nonnucleoside inhibitor of the human immunodeficiency virus type I reverse transcriptase. Antimicrob Agents Chemother. 1995; 39:2602-5. [PubMed 8592986]



4. Rabel SR, Maurin MB, Rowe SM et al. Determination of the pKa and pH-solubility behavior of an ionizable cyclic carbamate, (S)-6-chloro-4-(cyclopropylethynyl)-1,4-dihydro-4-(trifluoromethyl)-2H-3,1-benzoxazin-2-one (DMP 266). Pharm Dev Technol. 1996; 1:91-5. [PubMed 9552335]



5. Anon. Three new drugs for HIV infection. Med Lett. 1998; 40:114-6.



6. Spence RA, Kati WM, Anderson KS et al. Mechanism of inhibition of HIV-1 reverse transcriptase by nonnucleoside inhibitors. Science. 1995; 267:988-93. [PubMed 7532321]



7. Bacheler L, George H, Hollis G et al. Resistance to efavirenz (Sustiva) in vivo. 5th Conf Retrovir Oppor Infect. 1998:210. Abstract No. 703.



8. Jeffrey S, Baker D, Tritch R et al. Resistance and cross resistance profile for Sustiva (efavirenz, DMP 266). 5th Conf Retrovir Oppor Infect. 1998:210. Abstract No. 702.



9. Bacheler L, Weislow O, Snyder S et al. Virologic resistance to efavirenz. Int Conf AIDS. 1998; 12:287.



10. Winslow DL, Garber S, Reid C et al. Selection conditions affect the evolution of specific mutations in the reverse transcriptase gene associated with resistance to DMP 266. AIDS. 1996; 10:1205-9. [PubMed 8883581]



11. Merluzzi VJ, Hargrave KD, Labadia M et al. Inhibition of HIV-1 replication by a nonnucleoside reverse transcriptase inhibitor. Science. 1990; 250:1411-13. [PubMed 1701568]



12. De Clerq E. The role of non-nucleoside reverse transcriptase inhibitors (NNRTIs) in the therapy of HIV-1 infection. Antiviral Res. 1998; 38:153-79. [PubMed 9754886]



13. Tashima KT, Caliendo AM, Ahmad M et al. Cerebrospinal fluid human immunodeficiency virus type 1 (HIV-1) suppression