Emergency contraception works best when you use it as soon as possible after unprotected sex.
How long after depends on which type of emergency contraception you use.
- Take Plan B One-Step® or a generic version as soon as possible within three days (or 72 hours) after unprotected sex.
- For the two-dose version (Next Choice®, LNG tablets 0.75 mg), take one pill as soon as possible within 3 days and the second pill 12 hours later.
Take ella® (ulipristal acetate) as soon as possible within five days (or 120 hours) after unprotected sex.