Clinically reviewed by Dr. Pipat Finn, M.D., Senior Doctor, Doctor Pattaya.
Last reviewed: September 2026
If you had unprotected sex in Pattaya, the most important thing you can do is act within 72 hours. HIV PEP must be started as soon as possible after exposure. Emergency contraception works best within 72 hours. STI testing is available same-day at Doctor Pattaya, 24 hours a day, seven days a week.
You are sitting in your hotel room, somewhere between Jomtien and Walking Street, running through last night in your head. Maybe the condom broke. Maybe there was no condom at all. Whatever happened, you are here now, and that already puts you ahead of most people. The ones who do nothing are the ones I worry about.
Most STIs cause no symptoms for days, weeks, or even months. Feeling fine right now tells you nothing useful. What matters is what you do in the next few hours. This guide covers every step: how to honestly assess your risk, HIV PEP, emergency contraception, DoxyPEP, and when to test for what. If you are leaving Pattaya soon, there is a section for you too.
Step One: Honestly Assess Your Risk Level
Not every exposure carries the same risk, and how you respond should match what actually happened.
A condom that broke with a tested partner you know well is a different situation from unprotected sex with someone whose status you do not know. In Pattaya, where the commercial sex industry is large and HIV prevalence among certain groups is meaningfully higher than the general population, bareback exposure in that context carries a higher risk profile. Be honest with yourself. It matters for what comes next.
Ask yourself: was there penetration without a condom? Was it receptive or insertive? Was there ejaculation? Any visible sores, discharge, or bleeding? The answers shape whether PEP is warranted and how urgently you need to move.
Step Two: The 72-Hour Window for HIV PEP and DoxyPEP
This is the most time-sensitive part. Do not sleep on it.
HIV PEP, post-exposure prophylaxis, is a 28-day course of antiviral medication that can prevent HIV infection after a high-risk exposure. It works, but it must be started within 72 hours. Starting at hour 60 is not the same as starting at hour 10. Before we prescribe PEP at Doctor Pattaya, we run a baseline HIV test to confirm your current status. That is a clinical and ethical requirement, not a formality.
DoxyPEP is doxycycline 200mg taken as a single dose within 72 hours of condomless sex. Clinical trial data shows it reduces the risk of acquiring gonorrhea, chlamydia, and syphilis by between 47 and 66 percent. It is not appropriate for everyone. Current evidence supports its use in men who have sex with men and transgender women. Evidence in cisgender women is still limited, so a doctor needs to assess whether it is right for your situation.
Neither PEP nor DoxyPEP is available over the counter. You need a prescription and a clinical assessment. A pharmacy cannot do this for you.
If you are already on PrEP, pre-exposure prophylaxis, the risk calculation changes. Tell your doctor exactly what you have taken and when.
Step Three: Emergency Contraception for Female Patients
If there is any chance of pregnancy, this is also time-sensitive.
The morning-after pill is available at pharmacies across Pattaya without a prescription. It works best taken as soon as possible and remains effective up to 120 hours after unprotected sex, but effectiveness drops with every passing hour. Do not put this off.
Body weight affects how well some formulations work. A doctor can advise on which option is best for you and whether a higher dose is appropriate. If you are more than five days past the exposure, a copper intrauterine device is the most effective emergency contraceptive option available and can be placed by a doctor.
Step Four: STI Testing Windows and When Each Test Is Actually Accurate
Testing the morning after gives you a useful baseline but will not catch a fresh infection. Every STI has a window period, the gap between exposure and when a test can reliably detect anything. Testing too early gives a false negative, not a clean result.
| STI | Earliest Useful Test | Reliable Result |
|---|---|---|
| HIV (antigen/antibody) | 18 to 45 days | 45 days post-exposure |
| Gonorrhea | 1 to 2 weeks | 2 weeks post-exposure |
| Chlamydia | 1 to 2 weeks | 2 weeks post-exposure |
| Syphilis | 3 to 6 weeks | 6 weeks post-exposure |
| Herpes (HSV) | 12 to 16 weeks | 16 weeks post-exposure |
| Hepatitis B | 6 weeks | 3 months post-exposure |
A baseline test at the time of exposure is still worth doing. It confirms your status right now and rules out anything you did not know about before last night. For a full sexual health checkup in Pattaya, including all of the above, you can walk into Doctor Pattaya at any hour, no appointment needed.
One negative result immediately after exposure does not clear you. Come back for follow-up testing at the right window period.
Step Five: If You Are Leaving Pattaya Within 72 Hours
This comes up constantly. Tourists who had an exposure on their last night in town, flying out before they can even think straight.
If you are still within the 72-hour PEP window, get to a clinic now. We can prescribe a full 28-day course before you leave. You will need to continue it at home, and your doctor there should be informed. Doctor Pattaya can provide documentation of the prescription and clinical notes to hand to your physician when you land.
Emergency contraception can absolutely be taken before you fly. The morning-after pill is one tablet and takes two minutes to dispense.
Baseline STI testing can be completed before departure. Follow-up tests will need to happen at home at the right window period. We will write down exactly which tests you had, what the results were, and when follow-up is due. Do not decide that because you are leaving, nothing can be done. A lot can be done right now.
Why a Private Clinic Is the Right Call for This Situation
Thai pharmacies are excellent for many things. Post-exposure sexual health management is not one of them.
A pharmacist can sell you the morning-after pill. They cannot prescribe PEP, assess your HIV exposure risk, run a baseline blood test, or confirm whether DoxyPEP is appropriate for your situation. These things require a doctor.
A private clinic also means discretion. At Doctor Pattaya, we see this situation regularly. Nobody in the waiting room knows why you are there. No judgment, no lecture. You come in, we assess your risk honestly, we go through your options, and we put a plan in place. That is the whole point.
If you already picked up the morning-after pill from a pharmacy nearby, that is fine. Come to the clinic anyway if there is any HIV risk. PEP cannot wait. For anyone who wants to understand the full scope of STI treatment options in Pattaya before they come in, that information is on our site. And if you need a broader sexual health consultation in Pattaya, we handle that too.
If you had unprotected sex in Pattaya and need same-day help, Doctor Pattaya is open 24 hours a day, seven days a week. Walk in any time for HIV PEP assessment, DoxyPEP, emergency contraception, baseline STI testing, or a full sexual health consultation. We see tourists, expats, and local residents. No appointment needed. Hotel visits are available across Pattaya, Jomtien, Pratumnak, and Naklua if you cannot travel to us.
Frequently Asked Questions
Dr. Pipat Finn is the senior doctor at Doctor Pattaya Takecare Clinic, a 24/7 walk-in medical practice on South Pattaya Road, Chonburi, Thailand. They provide primary care, travel medicine, sexual health, vaccination, minor surgery, IV therapy, and emergency outpatient services for tourists, expatriates, and Pattaya residents. Languages: English and Thai. WhatsApp consultations: +66 95 073 5550. Call: +66 81 668 5557.
