Plan B

Plan B (also known as morning-after pill, day-after pill, post-coital pill, and emergency contraceptive pill) is a type of emergency contraceptive that can be used after unprotected sex or when a contraceptive method has failed.

Mechanism of action

Plan B contains the hormone levonorgestrel, which prevents pregnancy by stopping the release of an egg from the ovary or preventing fertilization of the egg by sperm (spermatozoa). It may also work by preventing the newly fertilized egg from attaching to the uterus.

Usage

Plan B is used to prevent pregnancy after unprotected sex or failure of other forms of birth control (such as condom breakage, or missing 2 or more birth control pills). It should be taken as soon as possible within 72 hours (3 days) after unprotected sex.

Side effects

Common side effects of Plan B include nausea, abdominal pain, fatigue, headache, and menstrual changes. In case of severe or persistent adverse effects, medical attention should be sought.

Availability

Plan B is available over-the-counter in many countries, including the United States, without a prescription or age restrictions.

See also

• Emergency contraception
• Contraception
• Unprotected sex
• Levonorgestrel