What is Levonorgestrel?

Levonorgestrel is a synthetic hormone used in emergency contraception to prevent pregnancy after unprotected sex or contraceptive failure. It is commonly known by brand names such as Plan B One-Step, Take Action, and My Way.

How Does Levonorgestrel Work?

Levonorgestrel primarily works by stopping or delaying ovulation. It may also prevent fertilization or implantation of a fertilized egg. It is most effective when taken as soon as possible, ideally within 72 hours after unprotected intercourse.

Dosage and Administration

The standard emergency dose is a single 1.5 mg tablet taken orally. It can be used by women of reproductive age and does not require a prescription in many countries.

Effectiveness

Levonorgestrel is around 89% effective in preventing pregnancy when taken within 72 hours. Its effectiveness decreases the longer the delay after unprotected sex. It is not intended for regular contraception.

Side Effects

• Nausea or vomiting
• Fatigue or dizziness
• Breast tenderness
• Irregular menstrual bleeding
• Abdominal pain

These side effects are generally mild and resolve within a few days.

Who Should Not Take Levonorgestrel?

Levonorgestrel may not be suitable for individuals with severe liver disease, unexplained vaginal bleeding, or known allergies to any component of the pill. It is not recommended for use as a regular birth control method.

Safety and Considerations

Levonorgestrel does not protect against sexually transmitted infections (STIs). It is safe for most women and does not affect future fertility. However, if vomiting occurs within 2 hours of taking the pill, a second dose may be needed.

Frequently Asked Questions (FAQs)

Can I take Levonorgestrel more than once in a cycle?

Yes, but repeated use may cause menstrual irregularities and is less effective than using a regular birth control method.

What if I vomit after taking the pill?

If vomiting occurs within 2 hours, another dose should be taken. Consult a healthcare provider if unsure.

Is Levonorgestrel effective after 3 days?

Its effectiveness declines after 72 hours. For emergency contraception up to 5 days, ulipristal acetate or a copper IUD may be more suitable.

Sources / Scientific References:

• World Health Organization. Emergency Contraception. WHO
• U.S. Food and Drug Administration (FDA). Levonorgestrel Information. FDA
• American College of Obstetricians and Gynecologists. Emergency Contraception Guidelines. ACOG
• Planned Parenthood. Emergency Contraception (Morning-After Pill). Planned Parenthood