Truvada vs Descovy for PrEP: Compared

Truvada and Descovy are both once-daily PrEP pills that prevent HIV before exposure, and both are highly effective. The big practical difference: Truvada covers risk from sex or injection drug use, while Descovy covers sex only and isn't approved for people assigned female at birth who are at risk through receptive vaginal sex. Descovy was designed with a friendlier kidney and bone profile.

What is PrEP, and what are Truvada and Descovy?

PrEP (pre-exposure prophylaxis) is medicine that HIV-negative people take before a possible exposure to keep HIV from taking hold in the body. It's prevention, not a cure — and not the same as PEP, which is the emergency course you start after a single possible exposure CDC PEP. Taken as prescribed, PrEP cuts the risk of getting HIV from sex by about 99% and from injection drug use by at least 74% CDC PrEP.

Truvada and Descovy are the two daily oral options. Each combines two antiviral drugs into one tablet you take at roughly the same time every day. They work by keeping protective drug levels in the tissues where HIV would try to establish itself — so if the virus shows up, it can't replicate and spread. Both reach full protection on a schedule, not instantly: about 7 days for receptive anal sex, and about 21 days for receptive vaginal sex and injection drug use. There's also an injectable option, Apretude, for people who'd rather not take a daily pill — but here we're comparing the two pills head to head.

The key differences between Truvada and Descovy

Who each one is approved for

Truvada is approved for people at risk through sex or injection drug use. Descovy is approved for people at risk through sex only — and specifically not for people assigned female at birth who are at risk through receptive vaginal sex. That exclusion isn't a quirk; the studies that supported Descovy's approval didn't include enough data on vaginal exposure to confirm it protects there. So if receptive vaginal sex is your route of risk, or if injection drug use is, Truvada is the pill that fits.

The kidney and bone profile

This is where Descovy was meant to stand out. Both pills are well tolerated by most people, but the tenofovir form in Descovy was engineered to deliver less drug into the bloodstream while keeping protective levels in the target tissues. In practice that tends to mean a gentler effect on the kidneys and on bone density. For most healthy people the difference is small, but it matters more if you already have reduced kidney function, lower bone density, or risk factors for either. We can check kidney function with a simple blood test before and during PrEP. If you want the full rundown of how these medicines feel day to day, see prep side effects.

What they don't do

Neither pill protects against other STIs — chlamydia, gonorrhea, and syphilis can still be passed during sex on PrEP — and neither prevents pregnancy. That's the most common misunderstanding I see: people start PrEP and assume they're covered for everything. You're not. People on PrEP should keep testing regularly, which is why routine screening stays part of the plan; you can get tested alongside your PrEP check-ins.

Truvada vs Descovy: side-by-side comparison

Which one applies to you?

Start with your route of risk, because that often decides it for you. If you're at risk through injection drug use, Truvada is your option — Descovy isn't approved there. If you're a person assigned female at birth at risk through receptive vaginal sex, Truvada again is the choice. For everyone else at risk through sex, both are on the table, and the conversation usually comes down to your kidney and bone health.

• Choose Truvada if your risk is through injection drug use, or through receptive vaginal sex — these are routes Descovy isn't approved to cover.
• Consider Descovy if your risk is through sex (and not receptive vaginal sex) and you have reduced kidney function, lower bone density, or other reasons to prefer its profile.
• Either pill works well for most healthy people at risk through anal sex — the decision then comes down to your labs, your insurance coverage, and your preference.

The practical next step

Starting PrEP begins with an HIV test, because PrEP is for HIV-negative people — taking it with an undiagnosed infection can cause problems. After that you'll have regular check-ins while you're on it: usually a brief follow-up to repeat the HIV test, check kidney function, and screen for other STIs. Both brick-and-mortar clinics and telehealth services prescribe PrEP, and assistance programs exist to help cover the cost, so price shouldn't be the thing that stops you.

One more practical point: PrEP is not morning-after protection. It only works taken on an ongoing schedule, and it needs that ramp-up window to reach full strength. If you've already had a possible exposure and aren't on PrEP, that's a PEP situation — a different, time-sensitive medicine. Knowing when to test after exposure helps you time things correctly. And for the broader picture of how treating HIV early protects partners too, see how earlier hiv treatment can help prevention.

When to talk to a clinician

Bring up PrEP with a clinician if you have ongoing risk through sex or injection drug use, if you're not sure which pill fits your situation, or if you have kidney or bone concerns that might steer the choice. Also reach out if you think you've already been exposed — don't wait to start PrEP, because that scenario calls for PEP instead. The visit is straightforward, the testing is routine, and the goal is simply matching you to the prevention that fits your body and your life.