How soon should I take the morning-after pill for it to work?

Reviewed by Yoshinori Abe, MD

Internal Medicine

The morning-after pill is most effective when taken as soon as possible after unprotected sex. For best results, take it within 72 hours (3 days), though some types may work up to 120 hours (5 days) later. The sooner it's taken, the higher the chance of preventing pregnancy.

If you're unsure whether you need emergency contraception, experiencing side effects, or worried about symptoms after unprotected sex, don't wait to get answers. Every hour matters when it comes to emergency contraception effectiveness. Take a free, instant, online symptom check to better understand your situation, evaluate potential risks, and get clear guidance on your next steps—all in just a few minutes, privately and from anywhere.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if emergency contraception will work now Discover what affects morning-after pill effectiveness Find out if pregnancy risk remains See OTC options for nausea relief Find a gynecologist for contraception advice Discover medically valid remedies for side effects Understand if your timing needs care today

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Explanation

The morning-after pill is a form of emergency contraception that is most effective when taken promptly after unprotected sex. According to the references, it is recommended to take the pill within 72 hours (3 days) for the best chance of preventing pregnancy.

Timing: The sooner the pill is taken, the more effective it will be.
Effectiveness: The pill is designed to prevent pregnancy by stopping or delaying ovulation.

It is important to remember that the morning-after pill is not intended for regular birth control use and should only be used in emergencies. If you're experiencing unusual symptoms or have concerns about your reproductive health, our free AI symptom checker can help you understand what might be happening. For personalized advice, it is best to consult with a healthcare provider.

(References)

Hansen LB, Saseen JJ, & Teal SB. (2007). Levonorgestrel-only dosing strategies for emergency .... Pharmacotherapy, 17253917.
Gold MA. (1997). Emergency Contraception: A Second Chance at .... Current opinion in pediatrics, 9300185.
Fine PM. (2011). Update on emergency contraception. Advances in therapy, 21153722.

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