Interaction Checker

New medicine: DoxyPEP

Friday 05 June 2026

We have added a new medicine to the PrEP interaction checker: Doxycycline for PEP (Post Exposure Prophylaxis), commonly known as DoxyPEP.

Doxycycline isn't used for PrEP (taken before sex to prevent acquiring HIV), but is taken after sex like a morning-after pill, to reduce your risk of catching syphilis and chlamydia. You can find out more about DoxyPEP from QueerHealth here.

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