Emergency Contraception Pill (Plan B)

Plan B and similar levonorgestrel pills lower the chance of pregnancy by 75-89%. The pills work best if you take them as soon as possible after unprotected sex, but they can work up to 3 days (72 hours) after unprotected sex.

Emergency contraception pills may not work as well for people who weigh over 165 pounds. If you weigh more than 165 pounds, ella (a different type of emergency contraception pill) or the Copper IUD may be better choices.

Emergency contraception pills work mainly by stopping an egg from being released (ovulation). They do not remove an implanted pregnancy.

Take the pill as soon as possible after unprotected sex. The sooner you take it, the better it works. It can be taken up to 3 days (72 hours) after unprotected sex.

Emergency contraception pills are not meant to be used as a regular form of birth control. They are best used as a backup when other methods fail or when no method was used.

Your period may come early, late, or at the expected time. The period may be heavier, lighter, or more spotty than usual.

Emergency contraception pills provide a second chance to prevent pregnancy after unprotected sex. They are available without a prescription.

You might have nausea, headache, tiredness, or stomach pain. These side effects usually go away within a day or two.

Emergency contraception pills are less effective than regular birth control methods.

Studies have not linked EC pills with serious side effects. In fact, pregnancy poses a greater health risk than EC pills.

No. However, correct use of condoms can prevent HIV and STIs.

Plan B and similar levonorgestrel pills are available at pharmacies without a prescription. They can cost $20-$50. Generic brands may cost less.

You can also buy emergency contraception pills online or get them from a health care provider.