PEP in Phuket: The 72-Hour Window, What You Are Given, and Side Effects

Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket. Last reviewed: October 2026

It is Sunday morning somewhere in Patong. The condom broke last night, or maybe you are not completely sure what happened. You pick up your phone, start searching, and every result says the same thing: 72 hours. That number is real, and it is already counting down. What most people do not know is what happens at the clinic, what you are actually given, and how to manage a 28-day course when you only have two weeks left on the island.

I see this several times a week. Some patients walk in within a few hours of the exposure. Others wait two days, still hoping the window is longer than it is. It is not. PEP works best when started as early as possible, and it stops working once 72 hours have passed. This article tells you exactly what to do, what to expect, and how to manage the medication while you are still in Phuket.

Why the 72-Hour Window for PEP Is Not a Rough Guideline

72 hours is a hard cutoff. After that point, the medication cannot do its job. PEP works by blocking HIV before it can establish itself in your body. The earlier you start, the better that process works.

Starting at 68 hours is better than not starting. Starting at 10 hours is better than 68. If it has been less than three days since the exposure, stop reading and come in now. You can read the rest later.

Who Actually Needs PEP

Not every exposure requires PEP. But if you had unprotected sex with someone whose HIV status you do not know, if a condom broke, if you shared needles, or if you experienced sexual assault, this is worth discussing with a doctor today. These are the situations I see most often in Phuket, and none of them are unusual here.

Contact with blood from an unknown source also qualifies. If the other person is confirmed HIV-negative, PEP is not needed. If there is any doubt about their status, do not wait to find out. Come in and we will assess it together.

What Happens at Takecare Clinic When You Walk In

No appointment is needed. You walk in, and we start straight away. Before any medication, we run a rapid HIV test to confirm you are HIV-negative at baseline. We also check kidney and liver function and hepatitis B status, because the medications are processed through those organs and we need to know they are working well. STI screening happens at this visit too, since a concurrent infection affects your risk level and your care plan.

None of this delays the first dose. The baseline tests and the first tablet happen in the same visit. Most patients are seen and out within about an hour. We document everything clearly, which matters if you need to continue the course with a doctor at home.

What You Are Given During PEP Treatment in Phuket

The regimen we use at Takecare Clinic Phuket combines tenofovir and emtricitabine with dolutegravir as the third agent. This is in line with current WHO guidelines and has a much better side effect profile than older PEP regimens. If you have heard from someone who took PEP years ago and felt terrible throughout, the medications have changed significantly since then.

You take the medication once daily for 28 days without stopping. Missing doses reduces how well PEP works. The 28-day course is not negotiable on duration, even if you feel completely fine after a week.

Managing Side Effects While You Are Still on Holiday

The most common side effects are nausea, fatigue, headache, and loose stools. These are usually worst in the first week and tend to settle after that. Most patients manage them without stopping.

Take the tablet with food. In Phuket’s heat, dehydration makes nausea noticeably worse, so drink more water than you think you need. Avoid heavy alcohol during the course. It compounds the nausea and puts extra strain on your liver while it is processing the medication. Store your tablets somewhere cool and away from direct sunlight, not in a beach bag sitting outside all afternoon.

If you miss a dose, take it as soon as you remember, unless it is nearly time for the next one. Do not double up. If you are travelling between islands or moving on to another country mid-course, make sure you have all 28 days with you before you leave Phuket. We provide the full supply at the first visit. If side effects feel severe or something unexpected comes up, walk back in. No appointment needed to return.

PEP vs PrEP: Which One Do You Need Right Now

PEP is for after an exposure that has already happened. PrEP is a daily tablet taken before any potential exposure, for people with ongoing risk. If you are reading this because something happened in the last 72 hours, PEP is what you need right now.

If the reason you needed PEP reflects a pattern, multiple partners, inconsistent condom use, or a regular partner whose status you are unsure of, then PrEP is worth discussing at your follow-up visit. I raise this with most patients who come in for PEP, not to judge the situation, but because ongoing protection is better than repeated emergency treatment. You can read more about HIV prevention options and when each applies on our STI service page.

Follow-Up Testing After Your 28-Day PEP Course

Finishing the course does not mean the process is over. You need a follow-up HIV test at 45 days after the original exposure. A 4th-generation antigen and antibody test at that point gives a reliable result. Some guidelines also recommend a confirmatory test at 90 days, especially if there is any uncertainty about the exact exposure timeline.

You can do this follow-up at Takecare Clinic if you are still in Phuket. If you have already left, we can advise exactly what test to request from a doctor at home. Our STD testing service in Phuket covers the full follow-up panel. Do not skip this step. Finishing the medication is not the same as having your answer.