Estarylla (Page 5 of 7)

7.3 Interference with Laboratory Tests

The use of contraceptive steroids may influence the results of certain laboratory tests, such as coagulation factors, lipids, glucose tolerance, and binding proteins.

7.4 Concomitant Use with HCV Combination Therapy — Liver Enzyme Elevation

Do not co-administer norgestimate and ethinyl estradiol with HCV drug combinations containing ombitasvir/paritaprevir/ritonavir, with or without dasabuvir, due to potential for ALT elevations [see WARNINGS AND PRECAUTIONS ( 5.3)].

8 USE IN SPECIFIC POPULATIONS

8.1 Pregnancy

There is little or no increased risk of birth defects in women who inadvertently use COCs during early pregnancy. Epidemiologic studies and meta-analyses have not found an increased risk of genital or non-genital birth defects (including cardiac anomalies and limb reduction defects) following exposure to low dose COCs prior to conception or during early pregnancy.

Do not administer COCs to induce withdrawal bleeding as a test for pregnancy. Do not use COCs during pregnancy to treat threatened or habitual abortion.

8.3 Nursing Mothers

Advise the nursing mother to use other forms of contraception, when possible, until she has weaned her child. COCs can reduce milk production in breastfeeding mothers. This is less likely to occur once breastfeeding is well-established; however, it can occur at any time in some women. Small amounts of oral contraceptive steroids and/or metabolites are present in breast milk.

8.4 Pediatric Use

Safety and efficacy of norgestimate and ethinyl estradiol tablets have been established in women of reproductive age. Efficacy is expected to be the same for post-pubertal adolescents under the age of 18 and for users 18 years and older. Use of this product before menarche is not indicated.

8.5 Geriatric Use

Norgestimate and ethinyl estradiol have not been studied in postmenopausal women and are not indicated in this population.

8.6 Hepatic Impairment

The pharmacokinetics of norgestimate and ethinyl estradiol has not been studied in subjects with hepatic impairment. However, steroid hormones may be poorly metabolized in patients with hepatic impairment. Acute or chronic disturbances of liver function may necessitate the discontinuation of COC use until markers of liver function return to normal and COC causation has been excluded. [See CONTRAINDICATIONS (4) and WARNINGS AND PRECAUTIONS (5.2).]

8.7 Renal Impairment

The pharmacokinetics of norgestimate and ethinyl estradiol has not been studied in women with renal impairment.

10 OVERDOSAGE

There have been no reports of serious ill effects from overdosage of oral contraceptives, including ingestion by children. Overdosage may cause withdrawal bleeding in females and nausea.

11 DESCRIPTION

Each of the following products is a combination oral contraceptive containing the progestational compound norgestimate and the estrogenic compound ethinyl estradiol. Norgestimate is designated as (18,19-Dinor-17-pregn-4-en-20-yn-3-one,17-(acetyloxy)-13-ethyl-, oxime,(17α)-(+)-) and ethinyl estradiol is designated as (19-nor-17α-pregna,1,3,5(10)-trien-20-yne-3,17-diol).

Each active blue tablet contains 0.25 mg of norgestimate and 0.035 mg of the ethinyl estradiol. Inactive ingredients include crospovidone, FD & C Blue No.2 Aluminum Lake, lactose anhydrous, magnesium stearate, and pregelatinized starch.
Each green placebo tablet containing only inert ingredients, as follows: crospovidone, D & C Yellow No.10 Aluminum Lake, FD & C Blue No.2 Aluminum Lake, lactose anhydrous, magnesium stearate, and pregelatinized starch.
Norgestimate StructureEthinyl Estradiol StructureNorgestimate StructureEthinyl Estradiol Structure

12 CLINICAL PHARMACOLOGY

12.1 Mechanism of Action

Oral Contraception

COCs lower the risk of becoming pregnant primarily by suppressing ovulation. Other possible mechanisms may include cervical mucus changes that inhibit sperm penetration and endometrial changes that reduce the likelihood of implantation.

12.2 Pharmacodynamics

No specific pharmacodynamic studies were conducted with norgestimate and ethinyl estradiol.

12.3 Pharmacokinetics

Absorption

Norgestimate (NGM) and EE are rapidly absorbed following oral administration. NGM is rapidly and completely metabolized by first pass (intestinal and/or hepatic) mechanisms to norelgestromin (NGMN) and norgestrel (NG), which are the major active metabolites of norgestimate.

Peak serum concentrations of NGMN and EE are generally reached by 2 hours after administration of norgestimate and ethinyl estradiol. Accumulation following multiple dosing of the 250 mcg NGM / 35 mcg EE dose is approximately 2-fold for NGMN and EE compared with single dose administration. The pharmacokinetics of NGMN is dose-proportional following NGM doses of 180 mcg to 250 mcg. Steady-state concentration of EE is achieved by Day 7 of each dosing cycle. Steady-state concentrations of NGMN and NG are achieved by Day 21. Non-linear accumulation (approximately 8 fold) of NG is observed as a result of high-affinity binding to SHBG, which limits its biological activity (Table 3).

Table 3: Summary of NGMN, NG and EE pharmacokinetic parameters.
Cmax = peak serum concentration, tmax = time to reach peak serum concentration, AUC0–24h = area under serum concentration vs time curve from 0 to 24 hours, t1/2 = elimination half-life, NC = not calculated.
NGMN and NG: Cmax = ng/mL, AUC0–24h = h∙ng/mL
EE: Cmax = pg/mL, AUC0–24h = h∙pg/mL

Mean (SD) Pharmacokinetic Parameters of Norgestimate and Ethinyl Estradiol During a Three Cycle Study

Analyte

Cycle

Day

Cmax

tmax (h)

AUC0–24h

t1/2 (h)

NGMN

1

1

1.78 (0.397)

1.19 (0.250)

9.90 (3.25)

18.4 (5.91)

3

21

2.19 (0.655)

1.43 (0.680)

18.1 (5.53)

24.9 (9.04)

NG

1

1

0.649 (0.49)

1.42 (0.69)

6.22 (2.46)

37.8 (14)

3

21

2.65 (1.11)

1.67 (1.32)

48.2 (20.5)

45 (20.4)

EE

1

1

92.2 (24.5)

1.2 (0.26)

629 (138)

10.1 (1.90)

3

21

147 (41.5)

1.13 (0.23)

1210 (294)

15 (2.36)

Food Effect

The effect of food on the pharmacokinetics of norgestimate and ethinyl estradiol has not been studied.

Distribution

NGMN and NG are highly bound (>97%) to serum proteins. NGMN is bound to albumin and not to SHBG, while NG is bound primarily to SHBG. EE is extensively bound (>97%) to serum albumin and induces an increase in the serum concentrations of SHBG.

Metabolism

NGM is extensively metabolized by first-pass mechanisms in the gastrointestinal tract and/or liver. NGM’s primary active metabolite is NGMN. Subsequent hepatic metabolism of NGMN occurs and metabolites include NG, which is also active, and various hydroxylated and conjugated metabolites. Although NGMN and its metabolites inhibit a variety of P450 enzymes in human liver microsomes, under the recommended dosing regimen, the in vivo concentrations of NGMN and its metabolites, even at the peak serum levels, are relatively low compared to the inhibitory constant (Ki ). EE is also metabolized to various hydroxylated products and their glucuronide and sulfate conjugates.

Excretion

The metabolites of NGMN and EE are eliminated by renal and fecal pathways. Following administration of 14 C-norgestimate, 47% (45 to 49%) and 37% (16 to 49%) of the administered radioactivity was eliminated in the urine and feces, respectively. Unchanged NGM was not detected in the urine. In addition to 17-deacetyl norgestimate, a number of metabolites of NGM have been identified in human urine following administration of radiolabeled NGM. These include 18, 19-Dinor-17-pregn-4-en-20-yn-3-one,17-hydroxy-13-ethyl,(17α)-(-);18,19-Dinor-5β-17-pregnan-20-yn,3α,17β-dihydroxy-13-ethyl,(17α), various hydroxylated metabolites and conjugates of these metabolites.

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