Sexual health

PEP After an Assault — What Care Should Cover

Save

You do not need every answer to get care. A visit after an assault can cover HIV PEP, preventive treatment and testing for other STIs, hepatitis B, and a plan for follow-up — and medical care is a separate decision from reporting. This is what good care should include, and why the first 72 hours matter most for preventing HIV.

Last updated: July 2026

Talk to a clinician

Gale can help you find a clinician in your state and request a visit.

Find care →

What care after an assault is time-sensitive?

The most time-sensitive piece is HIV PEP. To work, it should start as soon as possible — ideally within 24 hours and no later than 72 hours after the exposure 1. Pregnancy prevention is also time-limited. Other parts of care, such as testing for infections that take weeks to become detectable, can follow on a schedule, but the HIV clock is the one that cannot wait.

HIV PEP should begin within 72 hours of the exposure — sooner is better 1. This 72-hour limit is often called the pep window. It is the reason clinics and emergency departments treat a possible exposure as something to see quickly rather than something to schedule. If you are reading this soon after an exposure, being seen today rather than tomorrow is the single most useful step, because every hour inside the window counts.

How does HIV PEP work?

PEP, short for post-exposure prophylaxis, is a course of HIV medicines taken after a possible exposure to keep an infection from establishing itself. It is a one-time emergency measure, taken for 28 days, and it is different from PrEP, which is ongoing prevention taken before exposure rather than after 2. The earlier it starts, the better it works.

The difference between pep and prep matters here: PEP is a short, urgent course used after a specific exposure, while PrEP is taken continuously by people with ongoing risk. Before starting PEP, you will have a baseline HIV test, and you will have follow-up tests afterward, commonly around four to six weeks and again at about twelve weeks 1. The first dose is often given during the initial visit, before every result is back, precisely because the window is short.

What else should the visit cover?

A good visit looks past HIV. It should offer testing and, often, preventive treatment for the most common bacterial STIs — chlamydia and gonorrhea — because both are frequently silent and both are curable with antibiotics 34. It should also address hepatitis B, which can spread through sexual contact and is vaccine-preventable 5. Emergency contraception and care for any physical injuries are part of the same visit.

You do not have to ask for each of these by name. A clinician or a trained nurse experienced in assault care will usually walk through the whole list — HIV, other STIs, hepatitis B, pregnancy prevention, and injuries — and explain what each test or treatment is for before anything is done. It is fine not to know which infections you might have been exposed to; the standard approach covers the common ones, and follow-up testing fills in the rest over the following weeks.

Do I have to have a forensic exam or report it?

No. Medical care and evidence collection are separate decisions, and you can accept one without the other. A specialized exam by a trained nurse can treat you, document injuries, and — only if you choose — collect evidence that can be stored while you decide whether to report. Care can be provided whether or not you involve law enforcement.

Medical care and reporting are separate choices — you can be treated today without deciding anything else. Some people want time before making decisions, and that is allowed. Getting the time-sensitive medical care does not commit you to a police report, and choosing not to report does not close the door on treatment.

You can bring support and set the pace

Care after an assault does not have to be faced alone or rushed through. Many hospitals have trained advocates who can sit with you, explain each step, and help you weigh choices, and you can usually bring a trusted friend or family member with you. You can also ask for a specific gender of clinician, take breaks, and decline any part of the exam you are not ready for.

Going at your own pace does not put the time-sensitive care at risk. The HIV medicine can be started early in the visit while other decisions wait, so accepting prompt PEP never means having to make every other choice in the same moment. Consent guides the whole visit — nothing happens without your agreement, and you can stop at any point.

When should I be tested, and when are results reliable?

Testing happens in stages, because different infections take different amounts of time to become detectable. A baseline set of tests is done at the visit, then repeated on a schedule. HIV tests have a window period: nucleic-acid tests can detect infection roughly 10 to 33 days after exposure, laboratory antigen/antibody tests around 18 to 45 days, and rapid antibody tests around 23 to 90 days 6.

That window is the reason for follow-up. A test around twelve weeks after exposure is generally the one that gives a definitive answer for HIV, which is why the follow-up schedule extends that far even when earlier tests are reassuring 16. Writing down your test dates, or having the clinic schedule them before you leave, makes the follow-up much easier to keep to during an already stressful stretch.

What about protection going forward?

If there is ongoing risk, the visit can also start a plan for continued protection once the 28 days of PEP end. PEP is designed to transition into PrEP — an ongoing pill or a long-acting shot taken before exposure — for anyone who may face repeated risk 1. A clinician can walk through prep options and how the two fit together.

For many people, a single exposure is a one-time event and PrEP is not needed; for others, it is the start of a prevention plan, and a clinician can help you tell which situation you are in without pressure either way. It also helps to know your options for pep access after hours, since emergency departments can start PEP at any time if a clinic is closed. Knowing the medicine is reachable, day or night, means the 72-hour clock is rarely the barrier it first appears to be.

Common questions

HIV PEP can be started up to 72 hours after the exposure, and ideally within 24 hours — the sooner, the better. Because of that limit, an emergency department can begin it at any hour if clinics are closed. If more than 72 hours have passed, other parts of care still matter.

No. Medical care and reporting are separate decisions. You can be treated, have infections prevented and tested for, and, if you choose, have evidence collected and stored while you decide whether to report later. Choosing not to report does not affect your access to medical care.

HIV PEP may no longer be started, but the rest of care still applies. A clinician can test for and treat other STIs, offer hepatitis B protection, discuss pregnancy prevention where relevant, and set up follow-up testing. They can also discuss PrEP if there is ongoing risk going forward.

Some tests are done at the visit, but infections have window periods, so a single early test cannot rule everything out. Testing is repeated on a schedule, and a follow-up around twelve weeks is generally definitive for HIV. Your clinician will explain which tests happen when.

No. PEP is specifically for preventing HIV. Preventing or treating chlamydia, gonorrhea, and hepatitis B uses separate antibiotics or vaccination. A good visit covers all of these together, but they are different medicines aimed at different infections, given for different reasons.

Related

Say it back

How would you explain this to someone you love?

Two or three sentences, just as you’d say it. Gale reflects back what you focused on — a mirror, not a quiz.

Talk to a clinician

Gale can help you find a clinician in your state and request a visit.

Find care →

Getting care quickly

  • —Heavy bleeding, trouble breathing, severe pain, or a possible head injury — these need emergency care first
  • —It is approaching 72 hours since the exposure and HIV PEP has not been started
  • —Signs of a new infection in the days after, such as fever, unusual discharge, or pelvic pain

If you are in immediate danger or seriously injured, call 911. Because HIV PEP cannot be started later than 72 hours after exposure, an emergency department can begin it at any hour when a clinic is closed.

This is health information, not medical advice. What is right for you depends on the specifics of the exposure and your health, which a licensed clinician can assess in person.

References

  1. 1.Centers for Disease Control and Prevention (2025). Antiretroviral Postexposure Prophylaxis After Sexual, Injection Drug Use, or Other Nonoccupational Exposure to HIV - CDC Recommendations, United States, 2025. MMWR Recommendations and Reports, Vol. 74, No. 1. doi:10.15585/mmwr.rr7401a1The 2025 CDC guidelines for nonoccupational HIV PEP: first dose ideally within 24 hours and no later than 72 hours after exposure, a 28-day course, baseline HIV testing, follow-up at 4-6 and 12 weeks, and transition-to-PrEP planning for ongoing risk.
  2. 2.Centers for Disease Control and Prevention (2024). Clinical Guidance for PEP. CDC HIV Nexus. linkHIV PEP must be started as soon as possible and within 72 hours of exposure, is taken for 28 days, and is a one-time emergency measure for a specific exposure, in contrast to ongoing prevention with PrEP.
  3. 3.Centers for Disease Control and Prevention (2024). About Chlamydia. CDC (cdc.gov/chlamydia). linkChlamydia is a common, curable bacterial STI that is frequently asymptomatic and is treated with antibiotics.
  4. 4.St. Cyr S, Barbee L, Workowski KA, et al. (Centers for Disease Control and Prevention) (2020). Update to CDC's Treatment Guidelines for Gonococcal Infection, 2020. MMWR Morbidity and Mortality Weekly Report, Vol. 69, No. 50. doi:10.15585/mmwr.mm6950a6 ✓Uncomplicated gonorrhea is treated with an antibiotic injection, with doxycycline added when chlamydial coinfection has not been excluded.
  5. 5.Centers for Disease Control and Prevention (2024). Hepatitis B Basics. CDC (cdc.gov/hepatitis-b). linkHepatitis B is a vaccine-preventable liver infection that can spread through blood, semen, and other body fluids, including sexual contact.
  6. 6.Centers for Disease Control and Prevention (2024). Clinical Testing Guidance for HIV. CDC HIV Nexus. linkHIV test window periods by test type: nucleic-acid tests ~10-33 days after exposure, laboratory antigen/antibody tests ~18-45 days, and rapid antibody tests ~23-90 days.

6 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — citations link their sources. Editorial policy

← Back to the health library