What was the reduction in risk with compliant pre-exposure prophylaxis against HIV infection?

Updated: Aug 20, 2020
  • Author: Shelley A Gilroy, MD, FACP, FIDSA; Chief Editor: Michael Stuart Bronze, MD  more...
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Compliance is essential. In studies, the level of protection varied widely depending on how consistently participants used pre-exposure prophylaxis. Among those whose data (based on self-reports, bottles dispensed, and pill counts) indicate use on 90% or more days, HIV risk was reduced by 73%. Among those whose adherence by the same measure was less than 90%, HIV risk was reduced by only 21%. [153, 154]

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