PrEP (pre-exposure prophylaxis) is one of the most effective HIV prevention tools that exists, and it remains underused relative to how many people it could actually help — partly because it's still discussed as though it's relevant to a narrower group than it actually is.
How it works
PrEP is a medication — a daily oral pill or a longer-acting injectable, depending on the specific option — taken by an HIV-negative person to significantly reduce the risk of acquiring HIV if exposed. Taken consistently as prescribed, commonly cited effectiveness figures for sexual transmission are in the high-90s percent range. Effectiveness depends heavily on consistent use, which is why regular check-ins are built into how it's prescribed, not an optional add-on.
What it doesn't cover
PrEP is HIV-specific — it does not protect against other STIs and does not prevent pregnancy. See our birth control comparison and STI prevention guide for the other layers most people combine it with, since PrEP is designed to be one part of a broader approach, not a replacement for barriers if other risks are relevant.
Who it's actually for
Anyone with an ongoing, meaningful risk of HIV exposure — a category that includes people with a partner who has HIV (even one whose viral load isn't yet undetectable), people with multiple partners, people who inject drugs, and others, well beyond the specific groups PrEP has historically been marketed toward. A doctor or sexual health clinic can assess whether it's a fit for a specific situation.
Getting started
PrEP requires a prescription and typically an initial HIV test to confirm HIV-negative status before starting, followed by regular follow-up testing while using it. A sexual health clinic or doctor can walk through eligibility, options, and what ongoing monitoring involves.
Frequently asked questions
How effective is PrEP?
Very effective at preventing HIV specifically when taken as prescribed and consistently — commonly cited figures put it in the high-90s percent range for reducing risk from sex. Effectiveness depends heavily on consistent use, which is part of why regular follow-up appointments are built into how it's prescribed.
Does PrEP protect against other STIs or pregnancy?
No — PrEP is HIV-specific. It doesn't protect against other STIs or prevent pregnancy, which is why it's typically used as one layer alongside condoms or other methods, not a standalone replacement for them.
Who is PrEP actually for?
Anyone with an ongoing, meaningful risk of HIV exposure — a category broader than any single group, despite PrEP historically being marketed mostly toward gay and bisexual men. A doctor or sexual health clinic can assess whether it fits a specific situation.
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