Wegovy in Koh Samui: Is It Available on the Island and What Are Your Options

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

You are three weeks into Koh Samui, enjoying the slow mornings and the long beach lunches, and you realise your Wegovy pen is nearly empty. Or you have been thinking about starting semaglutide for months and figured you would sort it out somewhere along the way. Either way, you are now searching whether you can actually get it here, on the island, today, without flying to Bangkok.

The answer is yes. Wegovy is legally approved in Thailand and available at Doctor Samui’s clinic in Chaweng. Whether you are a tourist continuing an existing weight management programme, a long-stay expat ready to start one, or someone who needs a replacement pen after a beach bag situation went wrong, here is what you need to know.

Is Wegovy Actually Available on Koh Samui, Not Just in Bangkok?

Most clinics you find online list Koh Samui as a location, then send you to a Bangkok address or a courier delivery service. That is not the same thing.

Doctor Samui is physically on the island, in Chaweng. Wegovy is stocked here, prescribed in person, and patients are seen the same day. You do not need a home-country prescription to start. You do not need to wait for a courier from the capital.

Wegovy has Thai FDA approval and is legally prescribed at licensed clinics across Thailand. Cold-chain storage, keeping the pens refrigerated at the correct temperature from manufacturer to patient, is handled properly here. In a tropical climate, that matters more than most people realise.

Wegovy in the Heat: Storage and Injection Advice for Koh Samui

This is something no Bangkok-based clinic will think to mention. Koh Samui sits at 30 to 35 degrees Celsius outdoors for most of the year, and a Wegovy pen that gets too hot should not be used.

Before first use, your pen must be stored in a refrigerator at 2 to 8 degrees Celsius. Once you begin using it, it can stay at room temperature, up to 30 degrees, for up to 28 days. That is fine inside an air-conditioned room. It is not fine in a beach bag, a parked scooter basket, or direct sunlight.

Store your pen in the hotel mini-fridge when you are not using it. Use an insulated travel case if you are out for the day. If you think your pen has been exposed to excessive heat, do not inject it. Come into the clinic and we will check it and arrange a replacement if needed.

What If You Run Out of Wegovy While on Holiday in Koh Samui?

This happens more often than you would expect. Patients arrive having miscounted their doses, or the pen was damaged in transit, or they extended their trip longer than planned.

Missing more than two weeks of your dose is not ideal. You risk losing the appetite-suppressing effect, and if you restart at your usual dose after a long gap, side effects can hit harder. The right move is to get seen quickly.

At Doctor Samui, we can review your treatment history and, where clinically appropriate, prescribe a replacement pen at your current dose. Bring whatever documentation you have: a photo of your previous pen, a prescription printout, or your home clinic’s contact details. Same-day appointments are available at the Chaweng clinic, and if you cannot get there, we do hotel and villa visits across the island.

How Wegovy Differs from Ozempic and Mounjaro: Your Options in Thailand

All three are injectable weight management medications available in Thailand, but they are not the same thing.

Wegovy and Ozempic both contain semaglutide. Ozempic is licensed for type 2 diabetes management. Wegovy is approved specifically for chronic weight management, at a higher maintenance dose of 2.4 mg weekly. If your goal is weight loss and you do not have diabetes, Wegovy is the one designed for that purpose.

Mounjaro contains tirzepatide, a different molecule that targets two hormonal pathways instead of one. Trial data suggests it may produce greater average weight loss, but it also has a different side effect profile and a different titration schedule. Which option suits you depends on your health history, your BMI, and how you have responded to treatment before.

For a full side-by-side breakdown, the Doctor Samui GLP-1 page covers Wegovy versus Ozempic in detail. At your consultation, we go through the options and recommend what actually fits your situation.

Who Is a Good Candidate for Wegovy?

Wegovy is not for everyone, and a prescription without a proper assessment is not something we do here.

The standard threshold is a BMI of 30 or above, or a BMI of 27 or above with a weight-related health condition such as high blood pressure, high cholesterol, or pre-diabetes. A large cardiovascular study called the SELECT trial found meaningful reduction in heart-related risk among overweight adults with established heart disease, and this is now reflected in some prescribing guidelines.

Wegovy is not appropriate if you have a personal or family history of medullary thyroid carcinoma or a condition called MEN2. It is also not used during pregnancy. At your consultation, we go through your full medical history before prescribing anything.

Starting or Continuing Wegovy as an Expat or Long-Stay Resident on Koh Samui

If you are living on Samui full-time or spending several months here, a single pen is not what you need. You need a proper programme with someone who can monitor your progress over time.

Doctor Samui can set up an ongoing, doctor-supervised weight management plan. That means regular check-ins, dose titration done properly, and weight and metabolic tracking over time. Many long-stay expats have been putting this off, planning to sort it out back home or ordering pens online without any clinical oversight. That is not the safest approach.

Semaglutide is a powerful medication. Starting at a low dose and increasing slowly over several months is not optional. It is how you avoid the nausea and vomiting that comes with going too fast. We manage that process carefully for every patient.

What a Wegovy Consultation at Doctor Samui Includes

When you come in, we take a full medical history, check your BMI and blood pressure, and ask about any medications you are already taking. If you have existing blood results, bring them. If not, we can run basic bloods at the clinic.

We talk through your goals, your timeline, and which medication makes sense for you. If Wegovy is the right fit, the prescription is written and you can start the same day. We show you how to use the pen correctly, where to inject, and what to expect in the first few weeks.

You also leave with contact details for follow-up questions. That is not something a delivery service or online prescription platform gives you. If something feels off at week two, you have a doctor on the island who already knows your case.