During the first cycle of Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg use, instruct the patient to take one pink Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg daily, beginning on Day 1 of her menstrual cycle. (The first day of menstruation is Day 1.) She should take one pink Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg daily for 24 consecutive days, followed by one white inert tablet daily on Days 25 through 28. Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg should be taken in the order directed on the package at the same time each day, preferably after the evening meal or at bedtime with some liquid, as needed. Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg can be taken without regard to meals. If Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg are first taken later than the first day of the menstrual cycle, Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg should not be considered effective as a contraceptive until after the first 7 consecutive days of product administration. Instruct the patient to use a non-hormonal contraceptive as back-up during the first 7 days. The possibility of ovulation and conception prior to initiation of medication should be considered.
During the first cycle of Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg use, instruct the patient to take one pink Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg daily, beginning on the first Sunday after the onset of her menstrual period. She should take one pink Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg daily for 24 consecutive days, followed by one white inert tablet daily on Days 25 through 28. Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg should be taken in the order directed on the package at the same time each day, preferably after the evening meal or at bedtime with some liquid, as needed. Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg can be taken without regard to meals. Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg should not be considered effective as a contraceptive until after the first 7 consecutive days of product administration. Instruct the patient to use a non-hormonal contraceptive as back-up during the first 7 days. The possibility of ovulation and conception prior to initiation of medication should be considered.
When switching from another birth control pill, Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg should be started on the same day that a new pack of the previous oral contraceptive would have been started.
- When switching from a transdermal patch or vaginal ring, Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg should be started when the next application would have been due. When switching from an injection, Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg should be started when the next dose would have been due. When switching from an intrauterine contraceptive or an implant, Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg should be started on the day of removal.
Withdrawal bleeding usually occurs within 3 days following the last pink tablet. If spotting or breakthrough bleeding occurs while taking Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg, instruct the patient to continue taking Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg by the regimen described above. Counsel her that this type of bleeding is usually transient and without significance; however, advise her that if the bleeding is persistent or prolonged, she should consult her healthcare provider.
Although the occurrence of pregnancy is low if Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg are taken according to directions, if withdrawal bleeding does not occur, consider the possibility of pregnancy. If the patient has not adhered to the prescribed dosing schedule (missed one or more active tablets or started taking them on a day later than she should have), consider the possibility of pregnancy at the time of the first missed period and take appropriate diagnostic measures. If the patient has adhered to the prescribed regimen and misses two consecutive periods, rule out pregnancy. Discontinue Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg if pregnancy is confirmed.
The risk of pregnancy increases with each active pink tablet missed. For additional patient instructions regarding missed pills, see the "WHAT TO DO IF YOU MISS PILLS" section in the FDA Approved Patient Labeling. If breakthrough bleeding occurs following missed tablets, it will usually be transient and of no consequence. If the patient misses one or more white tablets, she should still be protected against pregnancy provided she begins taking a new cycle of pink tablets on the proper day.
For postpartum women who do not breastfeed or after a second trimester abortion, start Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg no earlier than 4 weeks postpartum due to the increased risk of thromboembolism. If the patient starts on Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg postpartum and has not yet had a period, evaluate for possible pregnancy, and instruct her to use an additional method of contraception until she has taken Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg for 7 consecutive days.
Contraception and Acne Clinical Trials
The data provided reflect the experience with the use of Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg in the adequate and well-controlled studies for contraception (N=1,056) and for moderate acne vulgaris (N=536).
For contraception, a Phase 3, multicenter, multinational, open-label study was conducted to evaluate safety and efficacy up to one year in 1,027 women aged 17 - 36 who took at least one dose of Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg. A second Phase 3 study was a single center, open-label, active-controlled study to evaluate the effect of 7 28-day cycles of Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg on carbohydrate metabolism, lipids and hemostasis in 29 women aged 18-35. For acne, two multicenter, double-blind, randomized, placebo-controlled studies, in 536 women aged 14-45 with moderate acne vulgaris who took at least one dose of Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg, evaluated the safety and efficacy during up to 6 cycles.
The adverse reactions seen across the 2 indications overlapped, and are reported using the frequencies from the pooled dataset. The most common adverse reactions (≥ 2% of users) were: headache/migraine (6.7%), menstrual irregularities (including vaginal hemorrhage [primarily spotting] and metrorrhagia (4.7%), nausea/vomiting (4.2%), breast pain/tenderness (4%) and mood changes (mood swings, depression, depressed mood and affect lability) (2.2%).
Adverse Reactions (≥1%) Leading to Study Discontinuation:
Contraception Clinical Trials
Of 1,056 women, 6.6% discontinued from the clinical trials due to an adverse reaction; the most frequent adverse reactions leading to discontinuation were headache/migraine (1.6%) and nausea/vomiting (1.0%).
Acne Clinical Trials
Of 536 women, 5.4% discontinued from the clinical trials due to an adverse reaction; the most frequent adverse reaction leading to discontinuation was menstrual irregularities (including menometrorrhagia, menorrhagia, metrorrhagia and vaginal hemorrhage) (2.2%).
Serious Adverse Reactions
Contraception Clinical Trials: migraine and cervical dysplasia
Acne Clinical Trials: none reported in the clinical trials
Substances diminishing the efficacy of COCs: Drugs or herbal products that induce certain enzymes, including cytochrome P450 3A4 (CYP3A4), may decrease the effectiveness of COCs or increase breakthrough bleeding. Some drugs or herbal products that may decrease the effectiveness of hormonal contraceptives include phenytoin, barbiturates, carbamazepine, bosentan, felbamate, griseofulvin, oxcarbazepine, rifampicin, topiramate and products containing St. John's wort. Interactions between oral contraceptives and other drugs may lead to breakthrough bleeding and/or contraceptive failure. Counsel women to use an alternative method of contraception or a back-up method when enzyme inducers are used with COCs, and to continue back-up contraception for 28 days after discontinuing the enzyme inducer to ensure contraceptive reliability.
Substances increasing the plasma concentrations of COCs: Co-administration of atorvastatin and certain COCs containing EE increase AUC values for EE by approximately 20%. Ascorbic acid and acetaminophen may increase plasma EE concentrations, possibly by inhibition of conjugation. CYP3A4 inhibitors such as itraconazole or ketoconazole may increase plasma hormone concentrations.
Concomitant administration of moderate or strong CYP3A4 inhibitors such as azole antifungals (e.g., ketoconazole, itraconazole, voriconazole, fluconazole), verapamil, macrolides (e.g., clarithromycin, erythromycin), diltiazem, and grapefruit juice can increase the plasma concentrations of the estrogen or the progestin or both. In a clinical drug-drug interaction study conducted in premenopausal women, once daily co-administration of DRSP 3 mg/EE 0.02 mg containing tablets with strong CYP3A4 inhibitor, ketoconazole 200 mg twice daily for 10 days resulted in a moderate increase of DRSP systemic exposure. The exposure of EE was increased mildly [see Warnings and Precautions (5.2) and Clinical Pharmacology (12.3)].
Human immunodeficiency virus (HIV)/ Hepatitis C virus (HCV) protease inhibitors and non-nucleoside reverse transcriptase inhibitors: Significant changes (increase or decrease) in the plasma concentrations of estrogen and progestin have been noted in some cases of co-administration with HIV/HCV protease inhibitors or with non-nucleoside reverse transcriptase inhibitors.
Antibiotics: There have been reports of pregnancy while taking hormonal contraceptives and antibiotics, but clinical pharmacokinetic studies have not shown consistent effects of antibiotics on plasma concentrations of synthetic steroids.
COCs Increasing the Plasma Concentrations of CYP450 Enzymes: In clinical studies, administration of a hormonal contraceptive containing EE did not lead to any increase or only to a weak increase in plasma concentrations of CYP3A4 substrates (e.g., midazolam) while plasma concentrations of CYP2C19 substrates (e.g., omeprazole and voriconazole) and CYP1A2 substrates (e.g., theophylline and tizanidine) can have a weak or moderate increase.
Clinical studies did not indicate an inhibitory potential of DRSP towards human CYP enzymes at clinically relevant concentrations [see Clinical Pharmacology (12.3)].
Women on thyroid hormone replacement therapy may need increased doses of thyroid hormone because serum concentration of thyroid-binding globulin increases with use of COCs.
Potential to Increase Serum Potassium Concentration: There is a potential for an increase in serum potassium concentration in women taking Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg with other drugs that may increase serum potassium concentration [see Warnings and Precautions (5.2) and Clinical Pharmacology (12.3)].
Contraception
Two studies evaluated the effect of 3 mg DRSP / 0.02 mg EE combinations on the suppression of ovarian activity as assessed by measurement of follicle size via transvaginal ultrasound and serum hormone (progesterone and estradiol) analyses during two treatment cycles (21-day active tablet period plus 7-day pill-free period). More than 90% of subjects in these studies demonstrated ovulation inhibition. One study compared the effect of 3 mg DRSP/0.02 mg EE combinations with two different regimens (24-day active tablet period plus 4-day pill-free period vs. 21-day active tablet period plus 7-day pill-free period) on the suppression of ovarian activity during two treatment cycles. During the first treatment cycle, there were no subjects (0/49, 0%) taking the 24-day regimen who ovulated compared to 1 subject (1/50, 2%) using the 21-day regimen. After intentionally introduced dosing errors (3 missed active tablets on Days 1 to 3) during the second treatment cycle, there was 1 subject (1/49, 2%) taking the 24-day regimen who ovulated compared to 4 subjects (4/50, 8%) using the 21-day regimen.
Acne
Acne vulgaris is a skin condition with a multifactorial etiology including androgen stimulation of sebum production. While the combination of EE and DRSP increases sex hormone binding globulin (SHBG) and decreases free testosterone, the relationship between these changes and a decrease in the severity of facial acne in otherwise healthy women with this skin condition has not been established. The impact of the antiandrogenic activity of DRSP on acne is not known.
Absorption
The absolute bioavailability of DRSP from a single entity tablet is about 76%. The absolute bioavailability of EE is approximately 40% as a result of presystemic conjugation and first-pass metabolism. The absolute bioavailability of Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg, which are a combination tablet of DRSP and EE stabilized by betadex as a clathrate (molecular inclusion complex), has not been evaluated. The bioavailability of EE is similar when dosed via a betadex clathrate formulation compared to when it is dosed as a free steroid. Serum concentrations of DRSP and EE reached peak levels within 1 to 2 hours after administration of Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg.
The pharmacokinetics of DRSP are dose proportional following single doses ranging from 1 to 10 mg. Following daily dosing of Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg, steady state DRSP concentrations were observed after 8 days. There was about 2 to 3 fold accumulation in serum Cmax and AUC (0–24h) values of DRSP following multiple dose administration of Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg (see Table 2).
For EE, steady-state conditions are reported during the second half of a treatment cycle. Following daily administration of Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg, serum Cmax and AUC (0–24h) values of EE accumulate by a factor of about 1.5 to 2 (see Table 2).
Table 2: Table of Pharmacokinetic Parameters of Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg (DRSP 3 mg and EE 0.02 mg)
|
|
|
| DRSP |
Cycle / Day | No. of
Subjects | Cmaxa (ng/mL) | Tmaxb (h) | AUC(0-24h)a
(ng•h/mL) | t1/2a (h) |
| 1/1
| 23
| 38.4 (25)
| 1.5 (1 - 2)
| 268 (19)
| NAc |
| 1/21
| 23
| 70.3 (15)
| 1.5 (1 - 2)
| 763 (17)
| 30.8 (22)
|
| EE |
Cycle / Day | No. of
Subjects | Cmaxa (pg/mL) | Tmaxb (h) | AUC(0-24h)a
(pg•h/mL) | t1/2a (h) |
| 1/1
| 23
| 32.8 (45)
| 1.5 (1 - 2)
| 108 (52)
| NAc |
| 1/21
| 23
| 45.1 (35)
| 1.5 (1 - 2)
| 220 (57)
| NAc |
Food Effect
The rate of absorption of DRSP and EE following single administration of a formulation similar to Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg was slower under fed (high fat meal) conditions with the serum Cmax being reduced about 40% for both components. The extent of absorption of DRSP, however, remained unchanged. In contrast, the extent of absorption of EE was reduced by about 20% under fed conditions.
Distribution
DRSP and EE serum concentrations decline in two phases. The apparent volume of distribution of DRSP is approximately 4 L/kg and that of EE is reported to be approximately 4-5 L/kg.
DRSP does not bind to SHBG or corticosteroid binding globulin (CBG) but binds about 97% to other serum proteins. Multiple dosing over 3 cycles resulted in no change in the free fraction (as measured at trough concentrations). EE is reported to be highly but non-specifically bound to serum albumin (approximately 98.5 %) and induces an increase in the serum concentrations of both SHBG and CBG. EE induced effects on SHBG and CBG were not affected by variation of the DRSP dosage in the range of 2 to 3 mg.
Metabolism
The two main metabolites of DRSP found in human plasma were identified to be the acid form of DRSP generated by opening of the lactone ring and the 4,5-dihydrodrospirenone-3-sulfate. These metabolites were shown not to be pharmacologically active. In in vitro studies with human liver microsomes, DRSP was metabolized only to a minor extent mainly by CYP3A4.
EE has been reported to be subject to presystemic conjugation in both small bowel mucosa and the liver. Metabolism occurs primarily by aromatic hydroxylation but a wide variety of hydroxylated and methylated metabolites are formed. These are present as free metabolites and as conjugates with glucuronide and sulfate. CYP3A4 in the liver is responsible for the 2-hydroxylation which is the major oxidative reaction. The 2-hydroxy metabolite is further transformed by methylation and glucuronidation prior to urinary and fecal excretion.
Excretion
DRSP serum concentrations are characterized by a terminal disposition phase half-life of approximately 30 hours after both single and multiple dose regimens. Excretion of DRSP was nearly complete after ten days and amounts excreted were slightly higher in feces compared to urine. DRSP was extensively metabolized and only trace amounts of unchanged DRSP were excreted in urine and feces. At least 20 different metabolites were observed in urine and feces. About 38–47% of the metabolites in urine were glucuronide and sulfate conjugates. In feces, about 17–20% of the metabolites were excreted as glucuronides and sulfates.
For EE the terminal disposition phase half-life has been reported to be approximately 24 hours. EE is not excreted unchanged. EE is excreted in the urine and feces as glucuronide and sulfate conjugates and undergoes enterohepatic circulation.
Use in Specific Populations
Pediatric Use: Safety and efficacy of Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg has been established in women of reproductive age. Efficacy is expected to be the same for postpubertal adolescents under the age of 18 and for users 18 years and older. Use of this product before menarche is not indicated.
Geriatric Use: Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg have not been studied in postmenopausal women and is not indicated in this population.
Race: No clinically significant difference was observed between the pharmacokinetics of DRSP or EE in Japanese versus Caucasian women (age 25–35) when 3 mg DRSP/0.02 mg EE was administered daily for 21 days. Other ethnic groups have not been specifically studied.
Renal Impairment: Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg are contraindicated in patients with renal impairment.
The effect of renal impairment on the pharmacokinetics of DRSP (3 mg daily for 14 days) and the effect of DRSP on serum potassium concentrations were investigated in three separate groups of female subjects (n=28, age 30–65). All subjects were on a low potassium diet. During the study, 7 subjects continued the use of potassium-sparing drugs for the treatment of their underlying illness. On the 14th day (steady-state) of DRSP treatment, the serum DRSP concentrations in the group with CLcr of 50–79 mL/min were comparable to those in the control group with CLcr ≥ 80 mL/min. The serum DRSP concentrations were on average 37% higher in the group with CLcr of 30–49 mL/min compared to those in the control group. DRSP treatment did not show any clinically significant effect on serum potassium concentration. Although hyperkalemia was not observed in the study, in five of the seven subjects who continued use of potassium-sparing drugs during the study, mean serum potassium concentrations increased by up to 0.33 mEq/L. [See Contraindications (4) and Warnings and Precautions (5.2).]
Hepatic Impairment: Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg are contraindicated in patients with hepatic disease.
The mean exposure to DRSP in women with moderate liver impairment is approximately three times higher than the exposure in women with normal liver function. Drospirenone and Ethinyl Estradiol Tablets, USP 3mg/0.02 mg have not been studied in women with severe hepatic impairment. [See Contraindications (4) and Warnings and Precautions (5.4).]
Drug Interactions
Consult the labeling of all concurrently used drugs to obtain further information about interactions with oral contraceptives or the potential for enzyme alterations.
Effects of Other Drugs on Combined Oral Contraceptives
Substances diminishing the efficacy of COCs: Drugs or herbal products that induce certain enzymes, including CYP3A4, may decrease the effectiveness of COCs or increase breakthrough bleeding.
Substances increasing the plasma concentrations of COCs: Co-administration of atorvastatin and certain COCs containing EE increase AUC values for EE by approximately 20%. Ascorbic acid and acetaminophen may increase plasma EE concentrations, possibly by inhibition of conjugation. In a clinical drug-drug interaction study conducted in 20 premenopausal women, co-administration of a DRSP (3 mg)/EE (0.02 mg) COC with the strong CYP3A4 inhibitor ketoconazole (200 mg twice daily) for 10 days increased the AUC(0-24h) of DRSP and EE by 2.68-fold (90% CI: 2.44, 2.95) and 1.40- fold (90% CI: 1.31, 1.49), respectively. The increases in C were 1.97-fold (90% CI: 1.79, 2.17) and 1.39-fold (90% CI: 1.28, 1.52) for DRSP and EE, respectively. Although no clinically relevant effects on safety or laboratory parameters including serum potassium were observed, this study only assessed subjects for 10 days. The clinical impact for a patient taking a DRSP-containing COC concomitantly with chronic use of a CYP3A4/5 inhibitor is unknown [see Warnings and Precautions (5.2)].
HIV/HCV protease inhibitors and non-nucleoside reverse transcriptase inhibitors: Significant changes (increase or decrease) in the plasma concentrations of estrogen and progestin have been noted in some cases of co-administration with HIV/HCV protease inhibitors or with non-nucleoside reverse transcriptase inhibitors.
Antibiotics: There have been reports of pregnancy while taking hormonal contraceptives and antibiotics, but clinical pharmacokinetic studies have not shown consistent effects of antibiotics on plasma concentrations of synthetic steroids.
Effects of Combined Oral Contraceptives on Other Drugs
COCs containing ethinyl estradiol may inhibit the metabolism of other compounds. COCs have been shown to significantly decrease plasma concentrations of lamotrigine, likely due to induction of lamotrigine glucuronidation. This may reduce seizure control; therefore, dosage adjustments of lamotrigine may be necessary. Consult the labeling of the concurrently-used drug to obtain further information about interactions with COCs or the potential for enzyme alterations.
In vitro, EE is a reversible inhibitor of CYP2C19, CYP1A1 and CYP1A2 as well as a mechanism-based inhibitor of CYP3A4/5, CYP2C8, and CYP2J2. Metabolism of DRSP and potential effects of DRSP on hepatic CYP enzymes have been investigated in in vitro and in vivo studies. In in vitro studies DRSP did not affect turnover of model substrates of CYP1A2 and CYP2D6, but had an inhibitory influence on the turnover of model substrates of CYP1A1, CYP2C9, CYP2C19, and CYP3A4, with CYP2C19 being the most sensitive enzyme. The potential effect of DRSP on CYP2C19 activity was investigated in a clinical pharmacokinetic study using omeprazole as a marker substrate. In the study with 24 postmenopausal women [including 12 women with homozygous CYP2C19 genotype] the daily oral administration of 3 mg DRSP for 14 days did not affect the oral clearance of omeprazole (40 mg, single oral dose) and the CYP2C19 product 5-hydroxy omeprazole. Furthermore, no significant effect of DRSP on the systemic clearance of the CYP3A4 product omeprazole sulfone was found. These results demonstrate that DRSP did not inhibit CYP2C19 and CYP3A4 in vivo.
Two additional clinical drug-drug interaction studies using simvastatin and midazolam as marker substrates for CYP3A4 were each performed in 24 healthy postmenopausal women. The results of these studies demonstrated that pharmacokinetics of the CYP3A4 substrates were not influenced by steady state DRSP concentrations achieved after administration of 3 mg DRSP/day.
Women on thyroid hormone replacement therapy may need increased doses of thyroid hormone because serum concentration of thyroid-binding globulin increases with use of COCs.
Interactions With Drugs That Have the Potential to Increase Serum Potassium Concentration: There is a potential for an increase in serum potassium concentration in women taking Drospirenone and Ethinyl Estradiol Tablets, USP 3 mg/0.02 mg with other drugs that may increase serum potassium concentration [see Warnings and Precautions (5.2)].
A drug-drug interaction study of DRSP 3 mg/estradiol (E2) 1 mg versus placebo was performed in 24 mildly hypertensive postmenopausal women taking enalapril maleate 10 mg twice daily. Potassium concentrations were obtained every other day for a total of 2 weeks in all subjects. Mean serum potassium concentrations in the DRSP/E2 treatment group relative to baseline were 0.22 mEq/L higher than those in the placebo group. Serum potassium concentrations also were measured at multiple time points over 24 hours at baseline and on Day 14. On Day 14, the ratios for serum potassium Cmax and AUC in the DRSP/E2 group to those in the placebo group were 0.955 (90% CI: 0.914, 0.999) and 1.010 (90% CI: 0.944, 1.08), respectively. No patient in either treatment group developed hyperkalemia (serum potassium concentrations > 5.5 mEq/L).