The Manufacturer states that you are not covered for any sex you have once you've taken the Plan B, so if you mean can you take it before hand, that's their answer.
You can take it immediately after sex, but it's not as reliable as regular hormonal birth control, & won't work if you are ovulating/fertile. For that you'd need one of the other 2 forms of emergency contraception, & even then, taking regular birth control is your best bet, if you're not already in an emergency situation.
Emergency contraception is simply better than nothing in the case of an emergency. It might help, it might not.
- Plan B Information for Consumers
- Plan B Information for Healthcare Professionals (includes dosage details)
- Side Effects of Plan B (detailed)
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