PrEP comes in a few different forms depending on which option you use: a small daily pill, an injection in the buttock every two months, or a newer injection under the skin every six months. The most common version is still the daily pill, and most people searching this question want to know what they’ll actually be holding in their hand or experiencing at a clinic visit.
What the Pills Look Like
The two FDA-approved oral PrEP medications look distinctly different from each other. The original, Truvada (and its generics), is a blue, capsule-shaped tablet. It’s become so recognizable that “the blue pill” is informal shorthand for PrEP in many communities. Generic versions may vary slightly in shade but keep the same general blue, oblong appearance.
Descovy, the newer pill option, is a blue, rectangular, film-coated tablet debossed with “GSI” on one side and “225” on the other. A lower-dose version of Descovy (used for adolescents) is a small white, round tablet marked with “GSI” and “15.” Both are easy to distinguish from each other and from most other medications in a medicine cabinet.
What the Injections Look Like
If you opt for injectable PrEP instead of a daily pill, there’s nothing you take home. The injection is administered by a healthcare provider, so your experience is simply showing up for an appointment.
The first injectable option, Apretude, is a single shot given in the gluteal muscle (the upper outer area of the buttock). Each dose is 3 mL of a white suspension drawn from a single-use vial. You get two initial shots one month apart, then return every two months after that. The needle goes into muscle tissue, similar to many routine vaccinations, though the volume is a bit larger than a typical flu shot.
A newer option, lenacapavir, was approved in June 2025 and only needs to be given every six months. It’s a subcutaneous injection, meaning it goes just under the skin rather than deep into muscle. Each visit involves two small injections (1.5 mL each) placed at least four inches apart, typically in the abdominal area. In clinical trials, it reduced HIV infection by 96 to 100 percent over a year of follow-up.
What the First Few Weeks Feel Like
Starting PrEP pills can come with mild side effects that some people call “start-up syndrome.” The most common are nausea, diarrhea, headache, fatigue, and stomach discomfort. These typically fade within the first few weeks as your body adjusts. Most people find them manageable, and many experience no noticeable side effects at all.
Protection doesn’t kick in immediately. For receptive anal sex, daily pills reach maximum protection after about 7 days of consistent use. For receptive vaginal sex or injection drug use, that timeline is longer: roughly 21 days of daily dosing. Until you hit those windows, other prevention methods are important.
What the Ongoing Routine Looks Like
Being on PrEP means more than just taking a pill or getting a shot. It comes with a schedule of regular medical check-ins that many people don’t expect. Before you start, your provider will run an HIV test, screen for sexually transmitted infections, and check kidney function. If you’re prescribed Descovy specifically, a cholesterol and triglyceride panel is also part of the baseline.
Once you’re on daily oral PrEP, the rhythm looks like this: every three months, you’ll get an HIV test. STI screening happens at varying intervals depending on your risk factors, but at minimum every six to twelve months. Kidney function gets checked annually for most users, or every six months if you’re over 50 or started with borderline kidney numbers. These appointments are quick, but they’re non-negotiable for staying on the medication safely.
For injectable PrEP users, the schedule is slightly different. HIV testing happens at each injection visit (every two months for Apretude, every six months for lenacapavir). STI screening intervals are similar to those for pill users. The trade-off is clear: you never have to remember a daily pill, but you do need to keep your injection appointments on time.
How PrEP Actually Prevents HIV
Both pill ingredients work the same way. They block an enzyme called reverse transcriptase, which HIV needs to copy itself inside your cells. When the drug is already present in your tissue before exposure, the virus enters a cell but can’t replicate. It essentially hits a dead end. The injectable options use different mechanisms to achieve the same result: lenacapavir, for instance, targets the virus’s outer shell rather than its replication machinery, but the practical outcome is identical. The virus can’t establish an infection.
What It Costs
Cost is one of the biggest concerns people have, and the answer depends heavily on your insurance situation. If you have prescription drug coverage, most private plans are required to cover PrEP with no out-of-pocket cost under the Affordable Care Act’s preventive services mandate.
If you don’t have insurance or your coverage denies the claim, two main programs can help. Manufacturer assistance programs provide the medication at no charge to people with household incomes up to 500% of the federal poverty level (roughly $63,800 for an individual, scaling up for larger households). Eligibility gets re-confirmed every six months. The federal Ready, Set, PrEP program also provides PrEP medication at no cost to anyone who lacks prescription drug coverage, has a negative HIV test, and has a valid prescription. Medication through these programs can be shipped directly to your home, sent to your provider’s office, or picked up at a pharmacy.