HIV infection is a serious concern for many, but today there is an emergency prevention method that can help — Post-Exposure Prophylaxis (PEP), a course of antiretroviral medication taken after potential exposure to HIV. It must be started within 72 hours of the risky event to effectively block the virus from establishing itself in the body. For those at high risk — such as having unprotected sex, experiencing sexual assault, or sharing needles — getting PEP immediately can be crucial in preventing HIV infection.

What is PEP (Post-Exposure Prophylaxis)?
PEP is a course of antiretroviral medication used after a potential exposure to HIV. To be effective, it must be started within 72 hours and continued for 28 days. While PEP can significantly reduce the risk of HIV infection, it is not a substitute for regular prevention methods like safe sex practices or the use of PrEP (Pre-Exposure Prophylaxis).
Why is PEP Important in HIV Prevention?
PEP works by preventing the HIV virus from taking hold in the body after exposure, such as:
- Unprotected sex
- Sharing needles
- Accidental contact with infected blood (e.g., needle-stick injuries)
For maximum effectiveness, PEP must be started as soon as possible, ideally within 72 hours, and taken consistently for 28 days. It is a critical emergency measure that can protect lives and long-term health in high-risk situations.
Who Should Consider Taking PEP?
- Individuals who had unprotected sex with someone at risk or with unknown HIV status
- Those whose condom broke or slipped during sex
- Survivors of sexual assault
- Healthcare workers exposed to blood or needle-stick injuries
- People who share needles for injecting drugs
What to Know Before Taking PEP
- Start within 72 hours of exposure: The sooner you begin, the more effective PEP will be. Do not wait beyond the 72-hour window.
- The faster you start, the better the outcome: Visit a doctor or healthcare provider as soon as possible to receive the medication and proper guidance.
- Complete a full 28-day course: Take the medication daily at the same time without missing a dose to ensure maximum effectiveness and avoid drug resistance.
- Consult a doctor before starting PEP: PEP should be administered under medical supervision to assess risk levels, conduct initial health screening, monitor for side effects, and arrange follow-up HIV testing after the course is complete.
Steps for Accessing PEP
- Risk assessment with a doctor: Begin by consulting a physician who will evaluate the level of risk based on your situation and determine whether PEP is necessary.
- HIV testing to confirm current status: A blood test is required to confirm that the person is HIV-negative before starting PEP, to ensure safety and proper treatment.
- Start PEP within 72 hours: The medication must be started within 72 hours after exposure. The earlier it begins, the more effective it is at preventing infection.
- Take medication for 28 consecutive days: The full course must be completed without missing any doses for optimal protection.
- Repeat HIV testing after 28 days: Once the course is finished, the doctor will conduct follow-up testing to confirm HIV-negative status and ensure safety.
PEP Side Effects
Some individuals may experience mild side effects such as nausea, headache, fatigue, or diarrhea. These symptoms are usually temporary and improve as the body adjusts. However, if symptoms become severe or uncomfortable, consult a doctor immediately for treatment adjustment.

Other HIV Prevention Methods Alongside PEP
While PEP is highly effective for emergency prevention, it should not be used as a long-term strategy. Sustainable and effective prevention includes:
- Using condoms every time you have sex to reduce the risk of HIV and other STIs.
- Getting regular sexual health checkups and HIV testing, ideally every 3–6 months or after any risky behavior.
- Taking PrEP (Pre-Exposure Prophylaxis) if you’re at high risk. PrEP involves taking antiretroviral medication daily and can reduce HIV risk by over 90%.
- Practicing safe and honest relationships, avoiding unprotected sex with multiple partners, and openly discussing sexual health with your partner.
- Maintaining both physical and mental wellness through exercise, sufficient rest, and stress management to keep your immune system strong.
Getting PEP at Phuket Medical Clinic
Phuket Medical Clinic is one of the leading facilities offering comprehensive, internationally standardized PEP (Post-Exposure Prophylaxis) services for individuals at risk of HIV exposure—whether from unprotected sex, accidental needle stick injuries, or other unexpected events. The PEP process here is clearly defined and safe, as outlined below:
- Consultation and Risk Assessment Clients will receive one-on-one consultations with experienced physicians to assess the level of risk and determine the suitability of starting PEP.
- Blood Testing Before Medication Blood tests are conducted to confirm the current HIV status and to screen for other related sexually transmitted infections (STIs).
- Issuance of PEP within 72 Hours If within the appropriate time frame (no more than 72 hours after exposure), the doctor will immediately prescribe PEP and provide proper guidance on how to take the medication correctly.
- Close Follow-Up and Monitoring The medical team will schedule a follow-up HIV blood test after 28 days of medication to confirm the outcome and offer further advice on sexual health.
- Service Fees and Costs PEP at Phuket Medical Clinic is reasonably priced and includes doctor consultation, blood testing, and the full 28-day course of medication. There are also periodic promotions and discounted packages to make high-quality prevention more accessible for those at risk.
- Privacy and Safety The clinic prioritizes maximum privacy, offering a secure and friendly consultation space for all clients.
Read More Articles
- Q&A about PEP Everything you need to know to prevent HIV infection
- Preventive and Emergency HIV Medications: A Detailed Understanding and How to Get Them
Contact Information
Laguna Branch
Phuket Medical Clinic – Laguna Branch is located at
- 58/1, Choeng Thale Subdistrict, Thalang District, Phuket 83100
- Open daily: Monday – Sunday, 09:00 AM–10:00 PM
- Contact via Line ID: @pmcphuket (Include @)
- Phone number: 096 236 2449
- Clinic Location: https://maps.app.goo.gl/SXaeLrSU9Lx47YPH6
- Online appointment booking: https://pmclaguna.youcanbook.me
Phuket Town Branch
Phuket Medical Clinic – Phuket Town Branch is located at
- 41/7-41/8, Talat Nuea Subdistrict, Mueang Phuket District, Phuket 83000
- Open daily: Monday – Sunday, 09:00 AM–9:00 PM
- Contact via Line ID: @pmcphuket (Include @)
- Phone number: 096 228 2449
- Clinic Location: https://maps.app.goo.gl/yeU9qNArGg3qdwZw9
- Online appointment booking: https://pmctown.youcanbook.me
Circle Clock Tower Branch
Phuket Medical Clinic – Circle Clock Tower Branch is located at
- 206/8 Phuket Rd, Taladyai, Mueang Phuket District, Phuket 83000
- Open daily: Monday – Sunday, 12:00 AM – 08:00 PM
- Contact via Line ID: @pmcphuket (Include @)
- Phone number: 096 696 2449
- Clinic Location: https://maps.app.goo.gl/svPvTabmmD1DHe9v9
- Online appointment booking: https://phuketmedicalclinic.youcanbook.me
If you’re at risk of HIV exposure—don’t delay! Seek consultation and start PEP as soon as possible at available service points in Phuket to protect your health and reduce future risk. Good health starts with timely prevention and proper care.
References
- Centers for Disease Control and Prevention (CDC). (2023). PEP (Post-Exposure Prophylaxis). Retrieved from: https://www.cdc.gov/hiv/basics/pep.html
- UNAIDS. (2023). Post-exposure prophylaxis (PEP). Retrieved from: https://www.unaids.org/en/resources/presscentre/featurestories/2023/june/20230627_pep
- World Health Organization (WHO). (2021). Post-exposure prophylaxis to prevent HIV infection. Retrieved from: https://www.who.int/news-room/fact-sheets/detail/post-exposure-prophylaxis-(pep)-to-prevent-hiv-infection
- Department of Disease Control, Ministry of Public Health Thailand. (2024). What is PEP and Who Should Use It? Retrieved from: https://ddc.moph.go.th/uploads/publish/1210420230610103146.pdf
- Thai AIDS Society. (2023). PEP Guidelines in Thailand. Retrieved from: http://www.thaiaidssociety.org/images/PDF/Guidelines-PEP-2023.pdf
