Does Plan B work?

Yes. Plan b is about 90% effective if taken within 3 days (72 hours) of having unprotected sex. It may still work up to 5 days (120 hours) after unprotected sex, but the failure rate is higher.
Plan B can work. Plan B pills contain a high dose of the active ingredient Levonorgestrel, which is a second generation progestin. Progestins, just like natural Progesterone cause the uterine endometrium to slough thus causing a period. It works mainly by stopping the release of an egg from the ovary. It is possible that it may also work by preventing fertilization of an egg and its attachment to the uterus.

Related Questions

Does Plan B work 4 days later?

Yes, but diminishing. Studies have shown that women can still benefit from using Plan B as late as 4 days after unprotected sex. It's better than not using is you're worried about pregnancy. The sooner you take Plan B after unprotected intercourse, the better, but taking it is better than not! hope that helps! Read more...

How does Plan B work, and how long does the medication stay in your body?

Preventing ovulation. The medication works by inhibitting ovulation. Thus, no egg, no pregnancy! the half-life of the medication varies greatly ranging from 11 to 45 hours and so it is difficult to say for sure. Based on this, it stays in the body for about 2.5 days to just over 1 wk. If you still have question, post it here or consult your doc. Good luck. Read more...

Does Plan B work every time? If not, when it doesn't work, do you get a damaged baby?

Plan B contraception. There is no medical evidence that Plan B would harm a developing baby. It will not hurt you or your baby if you accidently take it. Bottom line: it will not affect or disrupt an existing pregnancy. It can only reduce the chance of pregnancy when take up to 3 days after unprotected sex. Read more...

Does plan B work if you are not fertile?

Why would it matter. If you don't ovulate an or can otherwise not get pregnant, why take it or worry about it.This is how I interpret your question. If you had something else in mind, you might start over and re-submit with changes.This is not a chat room, and your ?? are not linked. Read more...