- BE SURE YOU HAVE READY AT ALL TIMES:
ANOTHER KIND OF BIRTH CONTROL (such as condoms or spermicide) to use as a back-up method in case you miss pills.
AN EXTRA, FULL PILL PACK.
Impaired Liver Function
Do not use norgestimate and ethinyl estradiol in women with liver disease, such as acute viral hepatitis or severe (decompensated) cirrhosis of liver [see
CONTRAINDICATIONS (4)].
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. Discontinue norgestimate and ethinyl estradiol if jaundice develops.
Liver Tumors
Norgestimate and ethinyl estradiol is contraindicated in women with benign and malignant liver tumors [see
CONTRAINDICATIONS (4)].
Hepatic adenomas are associated with COC use. An estimate of the attributable risk is 3.3 cases/100,000 COC users. Rupture of hepatic adenomas may cause death through intra-abdominal hemorrhage.
Studies have shown an increased risk of developing hepatocellular carcinoma in long-term (>8 years) COC users. However, the risk of liver cancers in COC users is less than one case per million users.
Unscheduled Bleeding and Spotting
Unscheduled (breakthrough or intracyclic) bleeding and spotting sometimes occur in patients on COCs, especially during the first three months of use. If bleeding persists or occurs after previously regular cycles, check for causes such as pregnancy or malignancy. If pathology and pregnancy are excluded, bleeding irregularities may resolve over time or with a change to a different contraceptive product.
In the clinical trial of norgestimate and ethinyl estradiol, the frequency and duration of unscheduled bleeding and/or spotting was assessed in 1,673 women (11,015 evaluable cycles). A total of 3 (0.2%) women discontinued norgestimate and ethinyl estradiol, at least in part, due to bleeding or spotting. Based on data from the clinical trials, 7 to 17% of women using norgestimate and ethinyl estradiol experienced unscheduled bleeding per cycle in the first year. The percent of women who experienced unscheduled bleeding tended to decrease over time.
Amenorrhea and Oligomenorrhea
Women who use norgestimate and ethinyl estradiol may experience amenorrhea. Some women may experience amenorrhea or oligomenorrhea after discontinuation of COCs, especially when such a condition was pre-existent.
If scheduled (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.
Common Adverse Reactions (≥ 2% of subjects)
The most common adverse reactions reported by at least 2% of the 1,723 women using the 28-day regimen were the following in order of decreasing incidence: headache/migraine (30.5%), nausea/vomiting (16.3%); breast issues (including tenderness, pain, enlargement, swelling, discharge, discomfort, cyst, and nipple pain) (10.3%), abdominal pain (9.2%), menstrual disorders (including dysmenorrhea, menstrual discomfort, menstrual disorder) (9.2%), mood disorders (including depression, mood altered, mood swings and depressed mood) (7.6%); acne (5.1%), vulvovaginal infection (3.5%), abdominal distension (2.8%), weight increased (2.4%) , fatigue (2.1%).
Adverse Reactions Leading to Study Discontinuation
In the clinical trial of norgestimate and ethinyl estradiol 4% of subjects discontinued the trial due to an adverse reaction. The most common adverse reactions leading to discontinuation were headache/migraine (1.2%), nausea/vomiting (0.7%), cervical dysplasia (0.7%), abdominal pain (0.4%), ovarian cyst (0.3%), acne (0.2%), flatulence (0.2%) and depression (0.2%).
Serious Adverse Reactions
Carcinoma of the cervix in situ (1 subject) and cervical dysplasia (1 subject).
Substances Decreasing the Plasma Concentrations of COCs
Drugs or herbal products that induce certain enzymes, including cytochrome P450 3A4 (CYP3A4), may decrease the plasma concentrations of COCs and potentially diminish the effectiveness of COCs or increase breakthrough bleeding. Some drugs or herbal products that may decrease the effectiveness of COCs include phenytoin, barbiturates, carbamazepine, bosentan, felbamate, griseofulvin, oxcarbazepine, rifampicin, topiramate, rifabutin, rufinamide, aprepitant and products containing St. John's wort. Interactions between COCs 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.
Colesevelam
Colesevelam, a bile acid sequestrant, given together with a COC, has been shown to significantly decrease the AUC of ethinyl estradiol (EE). The drug interaction between the contraceptive and colesevelam was decreased when the two drug products were given 4 hours apart.
Substances Increasing the Plasma Concentrations of COCs
Co-administration of atorvastatin or rosuvastatin and certain COCs containing EE increase AUC values for EE by approximately 20 to 25%. Ascorbic acid and acetaminophen may increase plasma EE concentrations, possibly by inhibition of conjugation. CYP3A4 inhibitors such as itraconazole, voriconazole, fluconazole, grapefruit juice, or ketoconazole may increase plasma hormone concentrations.
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/or progestin have been noted in some cases of co-administration with HIV protease inhibitors (decrease [e.g., nelfinavir, ritonavir, darunavir/ritonavir, (fos)amprenavir/ritonavir, lopinavir/ritonavir, and tipranavir/ritonavir] or increase [e.g., indinavir and atazanavir/ritonavir])/HCV protease inhibitors (decrease [e.g., boceprevir and telaprevir]) or with non-nucleoside reverse transcriptase inhibitors (decrease [e.g., nevirapine] or increase [e.g., etravirine]).
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 NGM. Mean pharmacokinetic parameters for NGMN, NG and EE during three cycles of administration of norgestimate and ethinyl estradiol are summarized in
Table 3.
Peak serum concentrations of NGMN and EE were generally reached by 2 hours after administration of norgestimate and ethinyl estradiol. Accumulation following multiple dosing of the 0.180 mg NGM / 0.025 mg EE dose is approximately 1.5 to 2 fold for NGMN and approximately 1.5 fold for EE compared with single dose administration, in agreement with that predicted based on linear kinetics of NGMN and EE. The pharmacokinetics of NGMN is dose proportional following NGM doses of 0.180 to 0.250 mg. Steady-state conditions for NGMN following each NGM dose and for EE were achieved during the three cycle study. Non-linear accumulation (4.5–14.5 fold) of NG was observed as a result of high affinity binding to SHBG, which limits its biological activity.
Table 3 Summary of NGMN, NG and EE pharmacokinetic parameters.
Table 3: Mean (SD) Pharmacokinetic Parameters of Norgestimate and Ethinyl Estradiol During a Three Cycle Study
| Analyte
1 | Cycle | Day | C
max | t
max (h)
| AUC
0–24h | t
1/2 (h)
|
|---|
NGMN(2, 3, 4) | 1 | 1 | 0.91 (0.27) | 1.8 (1) | 5.86 (1.54) | NC |
| 3 | 7 | 1.42 (0.43) | 1.8 (0.7) | 11.3 (3.2) | NC |
| | 14 | 1.57 (0.39) | 1.8 (0.7) | 13.9 (3.7) | NC |
| | 21 | 1.82 (0.54) | 1.5 (0.7) | 16.1 (4.8) | 28.1 (10.6) |
NG(2, 3, 4) | 1 | 1 | 0.32 (0.14) | 2 (1.1) | 2.44 (2.04) | NC |
| 3 | 7 | 1.64 (0.89) | 1.9 (0.9) | 27.9 (18.1) | NC |
| | 14 | 2.11 (1.13) | 4 (6.3) | 40.7 (24.8) | NC |
| | 21 | 2.79 (1.42) | 1.7 (1.2) | 49.9 (27.6) | 36.4 (10.2) |
EE(2, 3, 5) | 1 | 1 | 55.6 (18.1) | 1.7 (0.5) | 421 (118) | NC |
| 3 | 7 | 91.1 (36.7) | 1.3 (0.3) | 782 (329) | NC |
| | 14 | 96.9 (38.5) | 1.3 (0.3) | 796 (273) | NC |
| | 21 | 95.9 (38.9) | 1.3 (0.6) | 771 (303) | 17.7 (4.4) |
1NGMN = Norelgestromin, NG = norgestrel, EE = ethinyl estradiol
2C
max = peak serum concentration, t
max = time to reach peak serum concentration, AUC
0–24h = area under serum concentration vs. time curve from 0 to 24 hours, t
1/2 = elimination half-life.
3units for all analytes; h = hours
4units for NGMN and NG – C
max = ng/mL, AUC
0–24h = h•ng/mL
5units for EE only – C
max = pg/mL, AUC
0–24h = h•pg/mL
NC = not calculated
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
Following 3 cycles of administration of norgestimate and ethinyl estradiol, the mean (± SD) elimination half-life values, at steady-state, for NGMN, NG and EE were 28.1 (± 10.6) hours, 36.4 (± 10.2) hours and 17.7 (± 4.4) hours, respectively (
Table 2). The metabolites of NGMN and EE are eliminated by renal and fecal pathways.
Use in Specific Populations
Effects of Body Weight, Body Surface Area, and Age
The effects of body weight, body surface area, age and race on the pharmacokinetics of NGMN, NG and EE were evaluated in 79 healthy women using pooled data following single dose administration of NGM 0.180 or 0.250 mg / EE 0.025 mg tablets in four pharmacokinetic studies. Increasing body weight and body surface area were each associated with decreases in C
max and AUC
0–24h values for NGMN and EE and increases in CL/F (oral clearance) for EE. Increasing body weight by 10 kg is predicted to reduce the following parameters: NGMN C
max by 9% and AUC
0–24h by 19%, NG C
max by 12% and AUC
0–24h by 46%, EE C
max by 13% and AUC
0–24h by 12%. These changes were statistically significant. Increasing age was associated with slight decreases (6% with increasing age by 5 years) in C
max and AUC
0–24h for NGMN and were statistically significant, but there was no significant effect for NG or EE. Only a small to moderate fraction (5 to 40%) of the overall variability in the pharmacokinetics of NGMN and EE following norgestimate and ethinyl estradiol tablets may be explained by any or all of the above demographic parameters.