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How long do I have to take PrEP for it to be effective?

Scientists do not yet know how long it takes PrEP (pre-exposure prophylaxis) to become fully effective after you start taking it. Some studies suggest that if you take PrEP every day, it reaches its maximum protection in blood at 20 days, in rectal tissue at about 7 days, and in vaginal tissues at about 20 days.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.