What is PrEP and who actually needs it in Bangkok?

Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Doctor Bangkok. Last reviewed: July 2026

If you are new to Bangkok, recently single, or thinking more seriously about your sexual health, PrEP is worth understanding. A lot of expats I see have heard the word but are not sure what it means, whether they qualify, or how to get it here.

The short version: PrEP is a medication you take before potential HIV exposure to prevent infection. It is not a vaccine. It is not a cure. But when used correctly, it is one of the most effective HIV prevention tools we have. This article covers who it is for and what getting started looks like in Bangkok.

What Is PrEP?

PrEP stands for pre-exposure prophylaxis. You take it before a possible exposure to HIV, not after. Think of it like malaria tablets: you take them in advance to stop an infection from taking hold if you are exposed.

The most common form is a pill called TDF/FTC, sometimes sold under the brand name Truvada. There is also a long-acting injectable version called cabotegravir, which I will cover below. PrEP does not treat HIV. It prevents it. This is why an HIV test before starting is non-negotiable.

Who Should Consider PrEP?

I get asked this a lot, and the honest answer is: more people than you might think.

PrEP is worth considering if you are HIV-negative and have sex without condoms with partners whose HIV status you do not know. It is also relevant if you are in a relationship where one partner has HIV. Worth knowing: a person living with HIV who is on treatment with an undetectable viral load cannot sexually transmit the virus. This is called U=U, undetectable equals untransmittable. But not everyone has access to regular viral load testing, and not every partner’s status is known.

PrEP is also commonly used by gay and bisexual men, transgender women, people who inject drugs and share equipment, and anyone who has recently had an STI like gonorrhoea or syphilis. Frequent travellers who have casual sex in multiple countries are another group I see regularly at Doctor Bangkok.

You do not need to fit a specific identity. The question is simply: given your life right now, could HIV exposure happen? If the answer is yes, PrEP is worth a conversation.

Types of PrEP Available in Bangkok

Daily Oral PrEP

This is the most widely used option. You take one tablet every day at roughly the same time. Generic TDF/FTC versions are Thai FDA-approved and widely available at private clinics here. They cost substantially less than branded Truvada, which is still available if you prefer it.

On-Demand PrEP, the 2-1-1 Protocol

This option suits people who do not have sex every day. You take two tablets two to twenty-four hours before sex, one tablet twenty-four hours after that first dose, and one more tablet forty-eight hours after. That is where the name comes from: two, then one, then one.

This approach is WHO-endorsed with solid evidence behind it for men who have sex with men. It is not currently recommended for people with vaginal anatomy or for anyone with undiagnosed hepatitis B. If your sexual activity is occasional or unpredictable, this may suit you better than a daily pill.

Injectable PrEP, Cabotegravir

Cabotegravir, or CAB-LA, is given by injection every two months after an initial loading phase. It removes the need for daily pills and is highly effective. Availability at private clinics in Bangkok is growing, but it costs significantly more than oral PrEP. Ask at your clinic whether it is an option for you.

What Tests Do You Need Before Starting PrEP?

You cannot just walk in and pick up a prescription. There are four things we check before starting PrEP.

First, an HIV test. You must be HIV-negative before starting. We use a fourth-generation test, the most accurate type available. You can find more about window periods and what the results mean on our HIV testing page.

Second, kidney function. TDF/FTC is processed through your kidneys, so we check that they are working well before you start.

Third, hepatitis B. TDF/FTC is also active against hepatitis B. If you have hepatitis B and we later stop PrEP without a plan, your hepatitis B could rebound. We need to know your status before we begin.

Fourth, a baseline STI screen. PrEP protects only against HIV. We screen for gonorrhoea, chlamydia, syphilis, and other infections at the start and at every three-monthly follow-up. Together, PrEP and a regular STI screen give you a much fuller picture of your sexual health.

PrEP vs PEP: Which One Do You Need Right Now?

These are two different medications for two different situations.

PrEP is for before. You take it as an ongoing strategy when HIV exposure is a realistic possibility in your life. PEP is for after. If you have had a potential HIV exposure, PEP is emergency medication that must be started within 72 hours and taken for 28 days. The sooner you start, the better it works.

If you are reading this because something happened recently, do not wait. Go to a clinic today and ask for PEP, not PrEP. PrEP is not a substitute if an exposure has already occurred. Our team can advise which applies to your situation, and you can find more information on our HIV prevention and testing page.

Side Effects

Most people tolerate PrEP well. Some notice mild nausea, headache, or fatigue in the first few weeks, and these usually settle on their own.

Less commonly, TDF/FTC can affect kidney function or, over a long period, bone density. This is why three-monthly monitoring matters. It is not a reason to avoid PrEP, but it is a reason not to skip your follow-up appointments. If side effects are a concern, injectable cabotegravir has a different profile and may suit you better.

How Much Does PrEP Cost in Bangkok?

Bangkok is one of the more affordable cities in the world for PrEP, which is part of why medical tourists come here specifically for it.

Generic TDF/FTC, Thai FDA-approved, costs a fraction of what branded Truvada would cost in the US or UK without insurance. Your first visit includes a consultation fee and the cost of pre-PrEP blood tests. At three-monthly follow-ups, you pay for labs and a brief review. Injectable cabotegravir costs more for both the medication and the injection appointment. Contact Doctor Bangkok directly for current pricing, as costs can change.

Starting PrEP at Doctor Bangkok

The process is straightforward. You book a consultation, come in, and have blood taken the same day. Results for HIV and kidney function are usually back within twenty-four to forty-eight hours. If everything looks clear, we write your prescription and talk through which PrEP option makes sense for you.

Our doctors speak English. There is no judgment here. Whether you are an expat who has been in Bangkok for years or a visitor for two weeks, you will get the same clinical care and the same honest conversation.

If you are already on PrEP from your home country, we can usually continue your prescription. Bring your recent lab results, ideally from within the past three months, and the name of your current medication. Generic equivalents available here are Thai FDA-approved and often much cheaper than what you have been paying at home. Find out more about our sexual health services.

How quickly does PrEP start working after my first dose?

For receptive anal sex, protective drug levels build up after about seven days of consistent daily dosing. For vaginal sex, it can take up to three weeks. On-demand 2-1-1 PrEP works because the double loading dose front-loads those levels before sex. PrEP is not a morning-after solution: if an exposure has already happened, you need PEP, not PrEP.

Can I get PrEP in Bangkok as a tourist or short-term visitor?

Yes. Foreigners, expats, and medical tourists can access PrEP at private clinics in Bangkok without a Thai ID or residency status. Your first visit will include a same-day HIV test, kidney function check, and hepatitis B screen before any prescription is issued. If you are only here for a short time, on-demand 2-1-1 PrEP may be a practical option worth discussing with your doctor.

What is the difference between PrEP and PEP?

PrEP is taken before any exposure as an ongoing prevention strategy. PEP is emergency medication taken after a specific potential exposure and must be started within 72 hours. If something happened recently and you are reading this, go to a clinic today and ask for PEP. You can find more detail on our HIV testing page.

Does PrEP protect against other STIs like gonorrhoea or syphilis?

No. PrEP prevents HIV only. It does nothing against gonorrhoea, chlamydia, syphilis, herpes, or HPV. This is exactly why every three-monthly PrEP follow-up includes a full STI screen. Combining PrEP with condoms gives you the broadest protection available.

I am already on PrEP from my home country. Can I get a refill in Bangkok?

In most cases, yes. Bring your recent lab results, ideally from within the past three months, and your current prescription details. Generic TDF/FTC versions that are Thai FDA-approved are widely available here and are typically much cheaper than branded versions in Western countries. We will do a brief clinical review before issuing your prescription.

What happens at my three-monthly PrEP check-up?

We repeat your HIV test, check your kidney function, and run a full STI screen. The appointment itself is brief once your results are back. These check-ups are part of using PrEP safely and allow us to catch anything early if it does come up.