Interaction Checker
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.