Apri

Pharmacodynamics

Combined oral contraceptives act by suppression of gonadotropins. Although the primary mechanism of this action is inhibition of ovulation, other alterations include changes in the cervical mucus, which increase the difficulty of sperm entry into the uterus, and changes in the endometrium which reduce the likelihood of implantation.

Receptor binding studies, as well as studies in animals, have shown that 3-keto-desogestrel, the biologically active metabolite of desogestrel, combines high progestational activity with minimal intrinsic androgenicity.91,92 The relevance of this latter finding in humans is unknown.

Pharmacokinetics

Desogestrel is rapidly and almost completely absorbed and converted into 3-keto-desogestrel, its biologically active metabolite. Following oral administration, the relative bioavailability of desogestrel, as measured by serum levels of 3-keto-desogestrel, is approximately 84%.

In the third cycle of use after a single dose of Apri, maximum concentrations of 3-keto-desogestrel of 2,805 ± 1,203 pg/mL (mean ± SD) are reached at 1.4 ± 0.8 hours. The area under the curve (AUC0-∞) is 33,858 ± 11,043 pg/mL • hr after a single dose. At steady state, attained from at least day 19 onwards, maximum concentrations of 5,840 ± 1,667 pg/mL are reached at 1.4 ± 0.9 hours. The minimum plasma levels of 3-keto-desogestrel at steady state are 1,400 ± 560 pg/mL. The AUC0-24 at steady state is 52,299 ± 17,878 pg/mL • hr. The mean AUC0-∞ for 3-keto-desogestrel at single dose is significantly lower than the mean AUC0-24 at steady state. This indicates that the kinetics of 3-keto-desogestrel are non-linear due to an increase in binding of 3-keto-desogestrel to sex hormone-binding globulin in the cycle, attributed to increased sex hormone-binding globulin levels which are induced by the daily administration of ethinyl estradiol. Sex hormone-binding globulin levels increased significantly in the third treatment cycle from day 1 (150 ± 64 nmol/L) to day 21 (230 ± 59 nmol/L).

The elimination half-life for 3-keto-desogestrel is approximately 38 ± 20 hours at steady state. In addition to 3-keto-desogestrel, other phase I metabolites are 3α-OH-desogestrel, 3ß-OH-desogestrel, and 3α-OH-5α-H-desogestrel. These other metabolites are not known to have any pharmacologic effects, and are further converted in part by conjugation (phase II metabolism) into polar metabolites, mainly sulfates and glucuronides.

Ethinyl estradiol is rapidly and almost completely absorbed. In the third cycle of use after a single dose of Apri, the relative bioavailability is approximately 83%.

In the third cycle of use after a single dose of Apri, maximum concentrations of ethinyl estradiol of 95 ± 34 pg/mL are reached at 1.5 ± 0.8 hours. The AUC0-∞ is 1,471 ± 268 pg/mL • hr after a single dose. At steady state, attained from at least day 19 onwards, maximum ethinyl estradiol concentrations of 141 ± 48 pg/mL are reached at about 1.4 ± 0.7 hours. The minimum serum levels of ethinyl estradiol at steady state are 24 ± 8.3 pg/mL. The AUC0-24 at steady state is 1,117 ± 302 pg/mL • hr. The mean AUC0-∞ for ethinyl estradiol following a single dose during treatment cycle 3 does not significantly differ from the mean AUC at steady state. This finding indicates linear kinetics for ethinyl estradiol.

The elimination half-life is 26 ± 6.8 hours at steady state. Ethinyl estradiol is subject to a significant degree of presystemic conjugation (phase II metabolism). Ethinyl estradiol escaping gut wall conjugation undergoes phase I metabolism and hepatic conjugation (phase II metabolism). Major phase I metabolites are 2-OH-ethinyl estradiol and 2-methoxy-ethinyl estradiol. Sulfate and glucuronide conjugates of both ethinyl estradiol and phase I metabolites, which are excreted in bile, can undergo enterohepatic circulation.

REFERENCES

91. Kloosterboer, HJ et al. Selectivity in progesterone and androgen receptor binding of progestogens used in oral contraception. Contraception 1988; 38:325-32

92. Van der Vies, J and de Visser, J. Endocrinological studies with desogestrel. Arzneim Forsch/ Drug Res, 1983; 33(I), 2:231-6.

Ethinyl estradiol and desogestrel is a combination birth control pill that contains female hormones to prevent ovulation (the release of an egg from an ovary). This medicine also causes changes in your cervical mucus and uterine lining, making it harder for sperm to reach the uterus and harder for a fertilized egg to attach to the uterus.

Ethinyl estradiol and desogestrel is used to prevent pregnancy.

Ethinyl estradiol and desogestrel may also be used for purposes not listed in this medication guide.

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

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using birth control pills and call your doctor at once if you have:

• signs of a stroke--sudden numbness or weakness (especially on one side of the body), sudden severe headache, slurred speech, problems with vision or balance;

• signs of a blood clot in the lung--chest pain, sudden cough, wheezing, rapid breathing, coughing up blood;

• signs of a blood clot in your leg--pain, swelling, warmth, or redness in one or both legs;

• heart attack symptoms--chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating;

• liver problems--severe stomach pain, fever, tired feeling, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);

• a change in the pattern or severity of migraine headaches;

• swelling in your hands, ankles, or feet;

• a breast lump; or

• symptoms of depression--sleep problems, weakness, tired feeling, mood changes.

Common side effects may include:

• light vaginal bleeding or spotting;

• nausea (especially when you first start taking this medicine), vomiting, bloating;

• changes in weight or appetite;

• breast tenderness or swelling;

• freckles or darkening of facial skin, increased hair growth, loss of scalp hair;

• headache; or

• vaginal itching or discharge.

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.

Many drugs can interact with birth control pills and make them less effective, which may result in pregnancy. Ethinyl estradiol can also affect blood levels of certain other drugs, making them less effective or increasing side effects. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.

Desogestrel and ethinyl estradiol combination is used to prevent pregnancy. It is a birth control pill that contains two types of hormones, desogestrel and ethinyl estradiol, and when taken properly, prevents pregnancy. It works by stopping a woman's egg from fully developing each month. The egg can no longer accept a sperm and fertilization is prevented.

No contraceptive method is 100 percent effective. Birth control methods such as having surgery to become sterile or not having sex are more effective than birth control pills. Discuss your options for birth control with your doctor.

This medicine does not prevent HIV infection or other sexually transmitted diseases. It will not help as emergency contraception, such as after unprotected sexual contact.

This medicine is available only with your doctor's prescription.

Use this medicine as ordered by your doctor. Read all information given to you. Follow all instructions closely.

• Follow how to use as you have been told by the doctor or read the package insert.
• Take Apri at the same time of day.
• Take with or without food. Take with food if it causes an upset stomach.
• If you also take colesevelam, take it at least 4 hours before or after you take this medicine.
• Do not skip doses, even if you do not have sex very often.
• If you throw up or have diarrhea, Apri (ethinyl estradiol and desogestrel) may not work as well to prevent pregnancy. Use an extra form of birth control, like condoms, until you check with your doctor.
• If you miss 2 periods in a row, take a pregnancy test before starting a new cycle.

What do I do if I miss a dose?

• If a dose is missed, check the package insert or call the doctor to find out what to do. If using this medicine to prevent pregnancy, another form of birth control may need to be used for some time to prevent pregnancy.

Apri® (desogestrel and ethinyl estradiol tablets USP) is indicated for the prevention of pregnancy in women who elect to use oral contraceptives as a method of contraception.

Oral contraceptives are highly effective. Table 1 lists the typical accidental pregnancy rates for users of combined oral contraceptives and other methods of contraception. The efficacy of these contraceptive methods, except sterilization, the IUD, and the Norplant System depends upon the reliability with which they are used. Correct and consistent use of these methods can result in lower failure rates.

In a clinical trial with Apri (desogestrel and ethinyl estradiol tablets USP), 1,195 subjects completed 11,656 cycles and a total of 10 pregnancies were reported. This represents an overall user-efficacy (typical user-efficacy) pregnancy rate of 1.12 per 100 women-years. This rate includes patients who did not take the drug correctly.

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.

Apri (desogestrel and ethinyl estradiol tablets USP) has not been studied for and is not indicated for use in emergency contraception.

Smoking can increase your risk of blood clots, stroke, or heart attack caused by birth control pills, especially if you are older than 35.

This medication will not protect you from sexually transmitted diseases--including HIV and AIDS. Using a condom is the only way to protect yourself from these diseases.

Applies to desogestrel / ethinyl estradiol: oral tablet

Along with its needed effects, desogestrel / ethinyl estradiol may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking desogestrel / ethinyl estradiol:

• Abdominal or stomach pain
• absent, missed, or irregular menstrual periods
• anxiety
• change in vision
• changes in skin color
• chest pain or discomfort
• chills
• clay-colored stools
• constipation
• cough
• dark urine
• diarrhea
• dizziness, lightheadedness, fainting
• fever
• hives or welts
• itching skin or rash
• large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
• nausea and vomiting
• pain or discomfort in the arms, jaw, back, or neck
• pain, tenderness, or swelling of the foot or leg
• pains in the chest, groin, or legs, especially in the calves of the legs
• severe headaches of sudden onset
• slow or fast heartbeat
• sudden loss of coordination or slurred speech
• sudden onset of shortness of breath for no apparent reason
• sudden shortness of breath or troubled breathing
• sweating
• unusual tiredness or weakness
• vomiting of blood

Some side effects of desogestrel / ethinyl estradiol may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Bloating
• blotchy spots on the exposed skin
• breast enlargement or tenderness
• feeling sad or empty
• irritability
• itching of the vagina or outside the genitals
• loss of interest or pleasure
• pain during sexual intercourse
• thick, white curd-like vaginal discharge without odor or with mild odor
• trouble wearing contact lenses

Use is contraindicated. AU TGA pregnancy category: B3 US FDA pregnancy category: X Comments: -Women of childbearing potential should be advised to avoid becoming pregnant while receiving this medication. -Patients who become pregnant should discontinue this drug.

Animal studies of estrogen at high doses have revealed evidence of urogenital malformations. There are no controlled data for either drug in human pregnancy. Epidemiological data have failed to reveal an increased risk of birth defects when this drug was taken before pregnancy, and teratogenicity when patients inadvertently used this drug in early pregnancy. AU TGA pregnancy category B3: Drugs which have been taken by only a limited number of pregnant women and women of childbearing age, without an increase in the frequency of malformation or other direct or indirect harmful effects on the human fetus having been observed. Studies in animals have shown evidence of an increased occurrence of fetal damage, the significance of which is considered uncertain in humans. US FDA pregnancy category X: Studies in animals or humans have demonstrated fetal abnormalities and/or there is positive evidence of human fetal risk based on adverse reaction data from investigational or marketing experience, and the risks involved in use of the drug in pregnant women clearly outweigh potential benefits.