LEVONORGESTREL — levonorgestrel tablet
Pharmacist Pharmaceutical, LLC
Levonorgestrel Tablet, 1.5 mg is a progestin-only emergency contraceptive indicated for prevention of pregnancy following unprotected intercourse or a known or suspected contraceptive failure. To obtain optimal efficacy, the tablet should be taken as soon as possible within 72 hours of intercourse.
Levonorgestrel Tablet is available only by prescription for women younger than age 17 years, and available over the counter for women 17 years and older. Levonorgestrel Tablet is not indicated for routine use as a contraceptive.
Take Levonorgestrel Tablet orally as soon as possible within 72 hours after unprotected intercourse or a known or suspected contraceptive failure. Efficacy is better if the tablet is taken as soon as possible after unprotected intercourse. Levonorgestrel Tablet can be used at any time during the menstrual cycle.
If vomiting occurs within two hours of taking the tablet, consideration should be given to repeating the dose.
The Levonorgestrel Tablet is supplied as a white to off-white, round, flat tablets containing 1.5 mg of levonorgestrel and debossed with “NL 620” on one side and plain on the other side.
Levonorgestrel Tablet is contraindicated for use in the case of known or suspected pregnancy.
Ectopic pregnancies account for approximately 2% of all reported pregnancies. Up to 10% of pregnancies reported in clinical studies of routine use of progestin-only contraceptives are ectopic.
A history of ectopic pregnancy is not a contraindication to use of this emergency contraceptive method. Healthcare providers, however, should consider the possibility of an ectopic pregnancy in women who become pregnant or complain of lower abdominal pain after taking Levonorgestrel Tablet. A follow-up physical or pelvic examination is recommended if there is any doubt concerning the general health or pregnancy status of any woman after taking Levonorgestrel Tablet.
Levonorgestrel tablet is not effective in terminating an existing pregnancy.
Some women may experience spotting a few days after taking Levonorgestrel Tablet. Menstrual bleeding patterns are often irregular among women using progestin-only oral contraceptives and women using levonorgestrel for postcoital and emergency contraception.
If there is a delay in the onset of expected menses beyond 1 week, consider the possibility of pregnancy.
Levonorgestrel Tablet does not protect against HIV infection (AIDS) or other sexually transmitted infections (STIs).
A physical examination is not required prior to prescribing Levonorgestrel Tablet. A follow-up physical or pelvic examination is recommended if there is any doubt concerning the general health or pregnancy status of any woman after taking Levonorgestrel Tablet.
A rapid return of fertility is likely following treatment with Levonorgestrel Tablet for emergency contraception; therefore, routine contraception should be continued or initiated as soon as possible following use of Levonorgestrel Tablet to ensure ongoing prevention of pregnancy.
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.
Levonorgestrel Tablet was studied in a randomized, double-blinded multicenter clinical trial. In this study, all women who had received at least one dose of study medication were included in the safety analysis: 1,379 women in the Levonorgestrel Tablet group, and 1,377 women in the Plan B group (2 doses of 0.75 mg levonorgestrel taken 12 hours apart). The mean age of women given Levonorgestrel Tablet was 27 years. The racial demographic of those enrolled was 54% Chinese, 12% Other Asian or Black, and 34% were Caucasian in each treatment group. 1.6% of women in the Levonorgestrel Tablet group and 1.4% in Plan B group were lost to follow-up.
The most common adverse events (>10%) in the clinical trial for women receiving Levonorgestrel Tablet included heavier menstrual bleeding (30.9%), nausea (13.7%), lower abdominal pain (13.3%), fatigue (13.3%), and headache (10.3%). Table 1 lists those adverse events that were reported in > 4% of Levonorgestrel Tablet users.
|Most Common Adverse Events (MedDRA)|
|Heavier menstrual bleeding||30.9|
|Lower abdominal pain||13.3|
|Delay of menses (> 7 days)||4.5|
The following adverse reactions have been identified during post-approval use of Plan B (2 doses of 0.75 mg levonorgestrel taken 12 hours apart). Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
Abdominal Pain, Nausea, Vomiting
General Disorders and Administration Site Conditions
Nervous System Disorders
Reproductive System and Breast Disorders
Dysmenorrhea, Irregular Menstruation, Oligomenorrhea, Pelvic Pain
Drugs or herbal products that induce enzymes, including CYP3A4, that metabolize progestins may decrease the plasma concentrations of progestins, and may decrease the effectiveness of progestin-only pills. Some drugs or herbal products that may decrease the effectiveness of progestin-only pills include:
- St. John’s wort
Significant changes (increase or decrease) in the plasma levels of the progestin have been noted in some cases of co-administration with HIV protease inhibitors or with non-nucleoside reverse transcriptase inhibitors.
Consult the labeling of all concurrently used drugs to obtain further information about interactions with progestin-only pills or the potential for enzyme alterations.
Many studies have found no harmful 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 with progestin-only pills have not demonstrated significant adverse effects.
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