No. Emergency contraception does not protect you from STIs. To lower your risk of getting an STI, always use condoms when you have vaginal, oral, or anal sex.
See a doctor right away if you think you may have been exposed to an STI. Also, you can get medicine to help prevent HIV, the virus that causes AIDS.
If you were sexually assaulted, go to the nearest hospital emergency room as soon as possible. The National Sexual Assault Hotline(link is external) at 800-656-HOPE (4673) can help you find a hospital able to collect evidence of sexual assault. You can get medicine to prevent HIV and other STIs and get emergency contraception to prevent pregnancy.