PrEP in Koh Samui — How to Get It, What It Costs, and Who It Is For

Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Doctor Samui. Last reviewed: September 2026

Your trip extended by a week, the pills ran out three days ago, and you are sitting in a guesthouse near Lamai wondering what to do next. Or maybe you never started PrEP and want to now. Either way, this does not require a flight to Bangkok. You can sort it out here, on the island, often the same day.

PrEP reduces the risk of getting HIV through sex by around 99 percent when taken correctly, according to the CDC. It is a prescription medication, so a short consultation and some baseline blood tests come first. At Doctor Samui, first-time patients can get through the full process in a single visit at our Chaweng clinic, or at their hotel or villa if they prefer.

Who Should Be Taking PrEP

PrEP is not only for one type of person. It is for anyone who may be exposed to HIV without certainty about a partner’s status.

That includes men who have sex with men, people in relationships where one partner is HIV-positive, anyone who has had a recent STI, people who do not use condoms consistently, and anyone who injects drugs and shares equipment. It also includes travellers on Koh Samui who are sexually active and want a reliable safety net for the duration of their trip.

If you are unsure whether PrEP is right for your situation, our sexual health clinic can help you work through that during the consultation. We see this question from tourists, long-stay expats, and divers who live on the island year-round. There is no judgment here.

Daily PrEP vs On-Demand PrEP: Which Suits Your Trip?

Most people have only heard of one option: a pill every day. There is a second protocol, and it changes things significantly for short-stay visitors.

Daily oral PrEP, usually TDF/FTC (the generic form of Truvada), is taken at the same time each day. It reaches full protection after about seven days of consistent use. This is the standard option for most people, including cisgender women, transgender men, and anyone who injects drugs.

On-demand PrEP, also called the 2-1-1 protocol, is a WHO-endorsed option for cisgender men who have sex with men and transgender women. You take two pills two to twenty-four hours before sex, one pill twenty-four hours later, and one more pill forty-eight hours after that. No daily commitment. For a visitor spending ten days in Koh Samui who does not want a daily regimen, this is a genuinely practical choice. It is not suitable for everyone, so we go through your situation before recommending it.

What Tests Do You Need Before Starting PrEP in Koh Samui?

You cannot start PrEP without a negative HIV result. Starting PrEP when HIV is already present can cause drug resistance, so we always test first.

The standard pre-PrEP workup also includes a kidney function test, a hepatitis B test, and an STI screen. Most results come back quickly. At Doctor Samui, we aim to complete your baseline bloodwork and get you started within a single visit when results allow.

If you are a first-timer, bring any records you have. If you have none, we start from scratch. Our sexual health services cover the full pre-PrEP panel, and we explain every result in plain language before you leave.

Running Out of PrEP on Holiday in Koh Samui

This is one of the most common PrEP-related calls we receive. Someone is staying near Chaweng or Bophut, they packed for two weeks, their trip extended, and the pills are gone.

Here is what matters: if you have missed several days of daily PrEP, your protection has dropped. Do not assume you are still covered. Contact us, come in, or have us visit your hotel, and we will do a rapid HIV test before bridging your supply. The whole process is usually sorted within a few hours.

You do not need a prescription from your home country. Thai-licensed physicians can prescribe PrEP directly, and we can dispense the same day at the Chaweng clinic. Do not wait and hope for the best.

How Much Does PrEP Cost in Koh Samui?

Generic oral PrEP (TDF/FTC) is significantly cheaper in Thailand than in most Western countries. Monthly medication typically runs between 1,000 and 5,000 THB depending on brand and quantity. Your first visit will also include baseline testing costs on top of that.

Injectable PrEP, cabotegravir (Apretude), is given every two months instead of requiring a daily pill. It is a strong option for anyone who finds daily adherence difficult. It is more expensive and less widely available outside Bangkok, but worth discussing if it suits your situation.

Some travel insurance policies cover sexual health medications, including PrEP. Check your policy before assuming you will pay everything out of pocket. Contact Doctor Samui directly for current pricing, as medication costs can shift with supply.

Injectable PrEP on Koh Samui: What You Need to Know

Cabotegravir is a long-acting injection given every eight weeks after an initial loading dose. For long-stay expats or anyone who has tried daily pills and found them hard to keep up, it removes the adherence problem entirely.

Access to injectable PrEP on Koh Samui is more limited than in Bangkok. Talk to us about current availability. If we cannot source it locally, we will tell you straight and help you find the right path forward.

Ongoing PrEP Monitoring for Long-Stay Residents and Expats

Starting PrEP is not a one-time visit. Staying on it safely means regular check-ins.

Standard monitoring includes an HIV test every three months, an STI screen every three to six months, and a kidney function test every six months. These are not optional. They are how we catch problems early and confirm PrEP is still working for you.

For long-stay expats and divers living on Koh Samui, Doctor Samui handles all of this on the island. You do not need to travel to the mainland for follow-up. Blood draws and consultations can come to your villa or hotel through our 24/7 visit service if coming into Chaweng does not suit you.

How to Get PrEP at Doctor Samui

Walk in to our Chaweng clinic, call ahead, or book a hotel or villa visit. All consultations are confidential and we do not share your information. Staff speak English, German, and Hebrew. We are used to having this conversation with people who have never taken PrEP before and with people who have been on it for years.

For first-timers, allow around an hour for the consultation and initial testing. For a refill or bridging supply, it is much faster. Our sexual health services in Koh Samui cover everything from your first test to ongoing monitoring, all in one place.