Post exposure prophylaxis, commonly known as PEP, is a medical treatment used to reduce the risk of acquiring HIV after a possible exposure. It involves taking antiretroviral medicines for 28 days under the guidance of a healthcare professional. PEP may be recommended after certain sexual exposures, needle injuries.
PEP may be considered following exposures such as condom failure during sex when HIV transmission is possible, sharing injection equipment, or certain occupational injuries involving potentially infectious blood. Not every exposure requires PEP, so healthcare professionals assess the circumstances before recommending treatment.
Important facts about PEP medicines include:
Common medication combinations: Regimens often contain three antiretroviral medicines, commonly using an integrase inhibitor with two nucleoside or nucleotide reverse transcriptase inhibitors.
Examples of medicines: Depending on current guidelines and individual circumstances, regimens may include dolutegravir, tenofovir, and emtricitabine or lamivudine.
Starting treatment: PEP should begin as soon as possible, ideally within 24 hours and no later than 72 hours after a potential exposure.
Treatment duration: The recommended course is generally 28 days.
Medical assessment: A healthcare professional evaluates the exposure, medical history, existing medications, and relevant tests before or during treatment.
PEP does not guarantee that HIV infection will be prevented. It is also not a substitute for ongoing prevention strategies when repeated exposure is possible.
PEP is generally considered safe when prescribed appropriately, although some people experience side effects. These may include nausea, diarrhea, headache, tiredness, or abdominal discomfort. The type and severity of side effects depend on the medicines used and individual health factors. Anyone experiencing severe symptoms or a suspected serious reaction should contact a healthcare professional promptly.
Follow up care helps assess treatment tolerance and determine whether HIV infection has occurred. An initial HIV test may be performed when PEP is started, but it cannot exclude infection from a very recent exposure. Additional testing is necessary according to the recommended clinical schedule.
Important follow up measures include:
Complete the prescribed course: Take PEP for the full 28 days unless a healthcare professional advises otherwise.
Attend follow up appointments: Discuss side effects, missed doses, and any concerns with the treating clinician.
Complete HIV testing: Follow the recommended testing schedule, often including testing around 4 to 6 weeks and 12 weeks after exposure, depending on the applicable guideline and testing method.
Review other health needs: A clinician may recommend testing for other sexually transmitted infections and assessment for hepatitis or other infections when relevant.
Consider PrEP for future prevention: People who may experience ongoing HIV exposure can ask about pre exposure prophylaxis, known as PrEP.
PEP should not be delayed while waiting for symptoms or test results. Anyone who believes they may have been exposed to HIV should seek urgent medical care, even if they feel well. If more than 72 hours have passed, a clinician can assess the situation and discuss appropriate testing and prevention options.
Understanding PEP medicines, starting treatment promptly, completing the prescribed course, and attending follow up appointments are important parts of HIV exposure management. Reliable information and timely medical guidance help individuals understand their options and make informed decisions about HIV prevention.