PrEP (pre-exposure prophylaxis) can cost you nothing out of pocket. Most insurance plans cover it with no copay, and for the uninsured, manufacturer programs, federal initiatives, and clinic-based assistance bring the price to $0 for nearly everyone who qualifies. The medication, the visits, and the lab work all have a free or low-cost pathway.
risk reduction, taken as prescribed
daily Truvada/Descovy or the Apretude injection
not other STIs or pregnancy
| Item | Value |
|---|---|
| From sex | ~99% — risk reduction, taken as prescribed |
| From injection use | ≥74% |
| Forms | pill or shot — daily Truvada/Descovy or the Apretude injection |
| Protects against | HIV only — not other STIs or pregnancy |
What PrEP is and how it works
PrEP is medicine that HIV-negative people take before a possible exposure to keep HIV from taking hold in the body CDC. It's prevention, not treatment — you take it while you're at ongoing risk, not after the fact. The drugs keep a protective level of medication in your bloodstream and genital and rectal tissues, so if HIV does enter, it can't establish an infection.
This is different from PEP (post-exposure prophylaxis), the emergency option you start after a single possible exposure CDC PEP. The two aren't interchangeable: PrEP is the ongoing seatbelt, PEP is the emergency brake. If you've already had a risky exposure and aren't on PrEP, PEP is the route — and timing is everything, so see our guidance on when to test after exposure.
How well PrEP works (the numbers)
Taken as prescribed, PrEP reduces the risk of getting HIV from sex by about 99%. For people who inject drugs, it lowers risk by at least 74% when taken consistently. Those figures depend on actually taking it on schedule — adherence is what makes the difference. For a deeper breakdown, see how effective is prep at preventing hiv?.
Protection isn't instant. The medication needs time to build up, and that timeline varies by how you're exposed: about 7 days of daily dosing for receptive anal sex, and about 21 days for receptive vaginal sex and for injection drug use. Until you hit that mark, use condoms as backup.
How to use PrEP and who it's for
PrEP is for HIV-negative people who face a meaningful chance of exposure — through sex with partners whose status they don't know, sex with a partner living with HIV, or shared injection equipment. You don't need a "reason" beyond wanting protection. There are now several options:
- Truvada — a daily oral pill for people at risk through either sex or injection drug use.
- Descovy — a daily oral pill for those at risk through sex only; it isn't approved for people assigned female at birth who are at risk through receptive vaginal sex.
- Apretude (cabotegravir) — an injectable given as a shot, for people at risk through sex who weigh at least 77 pounds (35 kg). It's the option if you'd rather not take a daily pill.
Starting PrEP means an HIV test first — you have to be HIV-negative to begin — followed by regular check-ins while you're on it. Those visits aren't busywork: they confirm you're still HIV-negative, check kidney function, and screen for other STIs. Brick-and-mortar clinics and telehealth services both prescribe PrEP, so you can often get started without a long wait.
A common mistake is treating PrEP like morning-after protection. It only works taken on an ongoing schedule — a single pill before a risky night won't protect you. And because PrEP doesn't cover other infections, people on it still need to get tested regularly.
PrEP cost and how to get it free or low-cost
PrEP isn't just the pills or shot — the real cost has three parts: the medication, the clinic visits, and the lab tests. Each one has a pathway to free or near-free, which is why so many people pay $0. The trick is knowing which program fits your situation.
| What you're paying for | If you have insurance | If you're uninsured |
|---|---|---|
| Medication (pills or shot) | Usually covered with no copay; copay cards cover what's left | Manufacturer assistance programs and federal programs can cover the full cost |
| Clinic / telehealth visits | Typically covered as preventive care | Community health centers and dedicated PrEP programs offer free or sliding-scale visits |
| Lab work (HIV test, kidney, STI screening) | Generally covered as part of preventive PrEP care | Assistance programs and public health clinics often cover the required labs |
Here's how to actually reach $0:
- Use your insurance first. Preventive PrEP care — the drug plus the routine visits and labs — is generally covered without cost-sharing. If a bill shows up anyway, ask the clinic to recode it as preventive.
- Stack a copay or assistance card. If your plan leaves a copay, manufacturer copay programs frequently cover the remainder so you owe nothing for the medication.
- Patient assistance for the uninsured. Each PrEP medication has a manufacturer program that can supply the drug free to people without coverage who meet income criteria.
- Federal and state programs. National PrEP assistance initiatives and many state health departments cover medication and, in some cases, the visits and labs.
- Community and Title X clinics. Federally funded health centers and sexual-health clinics offer PrEP on a sliding scale or free, including the required lab work.
The practical move: don't assume you can't afford it. Most clinics and telehealth PrEP services have a navigator whose whole job is matching you to the program that gets you to zero — ask for one before you ever see a bill.
What PrEP does NOT protect against
PrEP is HIV-only. It does nothing against chlamydia, gonorrhea, or syphilis, and it doesn't prevent pregnancy. That's a real gap — rates of other STIs don't drop just because someone starts PrEP, which is exactly why regular STI screening is built into PrEP care. If you've stopped using condoms, your other-STI risk is still on the table, and that's worth planning around.
How PrEP fits with the rest of your prevention
PrEP works best as one layer, not the only layer. Pair it with routine testing — both for HIV and for the STIs PrEP misses — and you'll catch anything early. Condoms add protection against those other infections and against pregnancy. Vaccines (for hepatitis B and HPV, for example) cover risks no pill addresses.
Prevention also includes the people around you. When someone living with HIV is on effective treatment with an undetectable viral load, they can't transmit the virus sexually — so earlier hiv treatment can help prevention across a whole community, not just for the person being treated.
When to talk to a clinician
Reach out if you're HIV-negative and any of your circumstances put you at ongoing risk — new or multiple partners, a partner living with HIV, condomless sex, or shared injection equipment. A clinician will start with an HIV test, talk through which option fits your life, and set up the cost coverage. If you've had a possible exposure in the last few days and aren't on PrEP, say so right away — that's a PEP conversation, and it's time-sensitive.