Levonorgestrel
PLAN B
What it isProgestin; contraception, emergency contraception and the intrauterine system.
Why this oneThe intrauterine system gives years of contraception and treats heavy bleeding, and the emergency pill is available without prescription.
What limits itEmergency use is less effective with higher body weight and after ovulation. Irregular bleeding with the IUS.
FDA-approved for
- contraception (~1982)
FDA label
Read the full label on DailyMed ↗
| FDA dosing | Population | Start | Target | Max |
|---|---|---|---|---|
| Emergency contraception (backup after unprotected sex or contraceptive failure) | Females of reproductive potential | 1 tablet ASAP, within 72 hr | 1 tablet within 72 hr of unprotected sex | 1 tablet |
Renal Undefined
Hepatic Undefined
Use within 72 hours of unprotected sex.
Instructions
- Take as soon as possible within 72 hours (3 days) of unprotected sex — sooner is more effective.
Pregnancy Undefined
Lactation Undefined
NO BOXED WARNINGS
Principal riskEmergency use is less effective at higher body weight
Cost, est. cash$300–$2,500/month
Generic entry2009
Classes and tags
Clinical profile
Legacy pregnancy categoryX
Defining liabilityVenous thromboembolism and hormone-related adverse effects; estrogen also lowers lamotrigine exposure.
Mechanism of action: Levonorgestrel ballicule
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