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What is post-exposure prophylaxis (PEP)?
Post-exposure prophylaxis, usually called PEP, is a course of treatment taken after a possible exposure to HIV. It is used to help stop the virus taking hold in the body.
PEP is most effective when started as soon as possible after exposure, and within 72 hours at the latest. It is not a cure for HIV, and it is not the same as regular HIV prevention medicines such as PrEP.
When might PEP be needed?
PEP may be offered if someone has had a sexual exposure that could carry a risk of HIV. This can include condomless sex, a condom break, or sex with a person who has HIV and is not known to be undetectable.
It may also be used after other possible exposures, such as needle-stick injuries, sharing injecting equipment, or certain occupational exposures in healthcare. A clinician will assess the situation and decide whether PEP is appropriate.
How does PEP work?
PEP uses antiretroviral medicines that reduce the chance of HIV multiplying in the body after exposure. If the virus is stopped early enough, infection may be prevented.
The treatment is usually taken for 28 days. It is important to take every dose exactly as prescribed for the best chance of it working.
How do you get PEP in the UK?
In the UK, PEP is available from sexual health clinics and often from A&E departments or emergency care settings. If you think you need it, seek help immediately rather than waiting for symptoms.
Access and availability can vary slightly depending on where you live, but urgent assessment is the key. NHS staff can advise you on whether PEP is needed and how to start it quickly.
What else should you know?
PEP is usually accompanied by HIV testing, both at the start and after treatment. This is to make sure the exposure did not lead to infection and to check that the medicines are working as expected.
PEP can cause side effects such as nausea, tiredness, or headaches, but many people complete the course without major problems. If side effects are troublesome, a clinician can help with advice and support.
If you think you may have been exposed to HIV, do not wait to see if symptoms appear. Getting help quickly gives PEP the best chance of protecting you.
Frequently Asked Questions
Post-exposure prophylaxis (PEP) is a short-term course of treatment started after a potential exposure to an infection to help prevent infection from taking hold. It is most commonly discussed for HIV, but PEP can also refer to prevention after certain exposures to other infections.
Post-exposure prophylaxis (PEP) should be started as soon as possible after exposure, ideally within hours. For HIV PEP, treatment is generally recommended within 72 hours of exposure because effectiveness decreases after that window.
Eligibility for post-exposure prophylaxis (PEP) depends on the type of exposure, the source of exposure, and the infection being prevented. For HIV PEP, it is considered for people with a significant potential exposure, such as unprotected sex, needle sharing, or certain blood exposures.
Post-exposure prophylaxis (PEP) works by giving medications soon after exposure so the pathogen may not establish a lasting infection. In HIV PEP, antiretroviral medicines are used to block viral replication during the earliest phase after exposure.
Post-exposure prophylaxis (PEP) for HIV is typically taken for 28 days. The exact duration may vary depending on the infection involved and the clinical guidance provided by a healthcare professional.
The medications used for post-exposure prophylaxis (PEP) depend on the exposure. For HIV PEP, a combination of antiretroviral medicines is usually prescribed, and the specific regimen is chosen based on the exposure and the person's health history.
Common side effects of post-exposure prophylaxis (PEP) can include nausea, fatigue, headache, diarrhea, and stomach upset. Many people tolerate PEP well, and a clinician can help manage side effects if they occur.
If you miss a dose of post-exposure prophylaxis (PEP), take it as soon as you remember unless it is close to the time for your next dose. Follow the instructions from the prescribing clinician or pharmacist, and do not double up without medical advice.
Post-exposure prophylaxis (PEP) can be highly effective when started promptly and taken exactly as prescribed. Effectiveness depends on factors such as how soon treatment begins, the type of exposure, and adherence to the full course.
Yes, post-exposure prophylaxis (PEP) can be used after certain sexual exposures if there is a meaningful risk of infection, especially for HIV. A healthcare professional should assess the exposure as soon as possible to determine whether PEP is appropriate.
Yes, post-exposure prophylaxis (PEP) may be recommended after a needle-stick injury if the exposure could involve bloodborne infection risk, especially HIV. The decision depends on the source, the type of injury, and how the exposure occurred.
Post-exposure prophylaxis (PEP) may be considered after a needlestick from a used syringe because there can be a risk of bloodborne infection. Immediate medical evaluation is important to determine whether PEP is needed and whether other preventive care is required.
Post-exposure prophylaxis (PEP) can sometimes be used during pregnancy when the benefits outweigh the risks, especially for HIV exposure. A clinician should choose the safest appropriate regimen and monitor both the pregnant person and the fetus as needed.
Post-exposure prophylaxis (PEP) may be used while breastfeeding if clinically indicated, but the choice of medicines should be reviewed carefully. A healthcare professional can help balance the need for prevention with medication safety during breastfeeding.
Before starting post-exposure prophylaxis (PEP), a clinician usually reviews the exposure and may order baseline tests, such as HIV testing and sometimes kidney or liver tests. Additional tests may be recommended depending on the exposure and the medications used.
Follow-up testing after post-exposure prophylaxis (PEP) usually includes repeat HIV testing at recommended intervals and sometimes testing for other infections depending on the exposure. The exact schedule should be provided by the healthcare professional managing the case.
Yes, post-exposure prophylaxis (PEP) can refer to prevention after exposures to infections other than HIV, depending on the situation. Examples include preventive treatment after possible exposure to rabies or hepatitis B, where different medicines and time frames apply.
No, post-exposure prophylaxis (PEP) is taken after a potential exposure, while pre-exposure prophylaxis (PrEP) is taken before exposure to reduce the chance of infection. They are used for different purposes and are prescribed differently.
Post-exposure prophylaxis (PEP) is usually available through emergency departments, urgent care clinics, sexual health clinics, some primary care offices, and some pharmacies or hospital services. Because timing matters, it is best to seek care immediately after a possible exposure.
If you think you need post-exposure prophylaxis (PEP), seek medical care as soon as possible, ideally the same day and within 72 hours for HIV-related exposures. A clinician can assess the risk, start treatment if appropriate, and arrange follow-up testing and counseling.
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