Melatonin in Thailand: Import Rules, Brands & Access

Quick reference

Drug class: Hormone / sleep aid
Controlled substance: No, melatonin is not scheduled under Thailand's Narcotics Act or Psychotropic Substances Act
Prescription required: Not universally required, but local pharmacies may treat it as prescription-only in practice
Available locally: Limited, no confirmed registered brand in Thai pharmacies; generic products occasionally found in international pharmacies in Bangkok
Storage: Room temperature (below 25°C), away from humidity and direct light
Max supply to carry: No fixed national cap for non-controlled medications; bring your full trip supply plus a 20% buffer
Key document: Doctor's letter on clinic letterhead naming the medication, dose, quantity, and your diagnosis
Emergency alternative: If supply runs low, seek a private hospital in Bangkok with a sleep medicine or neurology department who can source or prescribe melatonin locally.

Melatonin in Thailand: what changes when you travel

Melatonin, sold globally as Circadin and Slenyto (extended-release formats approved in several European countries and Australia) and as Melatobel in Japan, is not classified as a controlled substance in Thailand under the Narcotics Act B.E. 2522 or the Psychotropic Substances Act B.E. 2518.

The practical challenge is that no melatonin brand has confirmed registration with Thailand's Food and Drug Administration (Thai FDA), meaning reliable local supply cannot be guaranteed. Bring your full supply from home, keep it in original packaging, and carry a doctor's letter in case customs or a pharmacist queries it.

Medical disclaimer: This guide is for informational purposes only and does not constitute medical advice. Always consult your prescribing doctor before travelling with medication, particularly regarding supply quantities, storage requirements, and import documentation.

Before you travel

Documentation for travelling to Thailand with melatonin

Melatonin does not require an import permit for Thailand, but Thai customs officers may query unfamiliar supplements. Travellers are allowed to carry medicines for personal use with supporting documentation. A doctor's letter on clinic letterhead naming the medication by its INN (melatonin), dose, frequency, quantity carried, and your diagnosis is sufficient for most situations.

Pre-travel paperwork timeline

T-30 days
Book an appointment with your prescribing doctor to obtain a formal doctor's letter. Request enough supply to cover your trip plus a 20% buffer.Prescriber letter
T-14 days
No import permit is required for melatonin in Thailand. Use this window to confirm your supply is in original, labelled pharmacy packaging and that the lot number and expiry date are visible.Original pharmacy packaging
No permit application needed; verify packaging instead.
T-7 days
Have your doctor's letter translated into Thai if possible; even a partial Thai translation reduces delays at customs. Store digital and printed copies separately.Translated letter
T-1 day
Print your doctor's letter and prescription. Pack melatonin in hand luggage in original packaging with the pharmacy label visible.
T-0 (border)
Melatonin is not a controlled substance, so proactive declaration is not legally required. Keep your documents accessible if a customs officer asks about unlabelled or bulk supplement packaging.

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What your doctor's letter must include

Full legal name, medication INN (melatonin) and any brand name used, dose and frequency, quantity being carried, your diagnosis (one or two words), doctor's signature and medical licence number, and clinic letterhead with contact details. A Thai translation is not legally mandatory but speeds up any customs query.

No notarisation or apostille is required for a personal-use medication letter entering Thailand. A plain English letter on headed clinic paper is acceptable.

How much melatonin to bring

Thailand sets no explicit quantity cap for non-controlled personal-use medications, but Thai FDA guidance recommends a quantity appropriate to the duration of stay. Bring your exact trip supply plus a 20% buffer to account for delays or lost luggage. Because melatonin is not reliably stocked in Thai pharmacies, treat your home supply as irreplaceable.^[1]

Split your supply

Carry your main supply in hand luggage and a backup portion in checked luggage. If one bag is lost or delayed, you still have medication. Keep both portions in original, labelled pharmacy packaging.

Packing and storing melatonin for travel

Melatonin tablets should be stored below 25°C and protected from humidity and direct light. Thailand's average ambient temperature in Bangkok regularly exceeds 30°C, so keep your supply in an air-conditioned environment whenever possible and avoid leaving it in a bag in direct sun. During transit, an insulated pouch or a small cooling wallet adds protection without refrigeration. Keep tablets in the original blister pack or bottle with the lid tightly closed to minimise humidity exposure.^[2]

At the airport and border

Airport security with melatonin

Melatonin in tablet or capsule form passes through X-ray screening without issue and is not subject to liquid restrictions. Keep it in your hand luggage in original packaging with a visible pharmacy label. Security staff at Suvarnabhumi (BKK) and Don Mueang (DMK) airports follow standard checkpoint procedures and are unlikely to query a labelled supplement, but having your doctor's letter to hand resolves any uncertainty quickly.

Customs and medication import rules for Thailand

Melatonin is not scheduled under the Thai Narcotics Act B.E. 2522 or the Psychotropic Substances Act B.E. 2518, so it does not require a customs declaration. require that the quantity be consistent with personal use for the duration of stay. Carry your doctor's letter and original packaging in case an officer requests documentation. Bulk quantities without documentation may be detained for inspection.

Keep original packaging

Transferring melatonin into an unmarked pill box removes the pharmacy label that identifies the substance, quantity, and dispensing date. Thai customs officers recognise original packaging as evidence of personal use. Keep tablets in the original blister pack or labelled bottle for the entire journey.

While in country

Melatonin availability in Thailand

Brands of melatonin sold in Thailand

Brand name	Indication	Formulation	Supply note
Generic melatonin (unbranded)	Sleep	Tablet (various strengths)	Occasionally available at international pharmacies in Bangkok; not confirmed registered with Thai FDA

No melatonin brand, including Circadin or Slenyto, has confirmed marketing authorisation from the Thai Food and Drug Administration (Thai FDA). Some international pharmacies in Bangkok, particularly those serving expatriate communities in areas such as Sukhumvit, carry unbranded melatonin tablets, but stock is inconsistent and quality assurance varies.

A private hospital consultation costs approximately ฿1,500 to ฿3,000 (~$46 to ~$92 / ~€43 to ~€85) and is the most reliable route to obtain melatonin locally if your supply runs low.

Finding a doctor who can prescribe melatonin in Thailand

Private hospitals in Bangkok with neurology or sleep medicine departments, such as Bumrungrad International Hospital and Bangkok Hospital, have English-speaking physicians and can issue a local prescription for melatonin.

A sleep medicine or neurology consultation at a private Bangkok hospital typically costs ฿1,500 to ฿3,000 (~$46 to ~$92 / ~€43 to ~€85). Telemedicine services operating in Thailand may also be able to issue a prescription, though dispensing depends on local pharmacy stock. See our Thailand travel guide and corresponding city guides for context on provider options.

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Storing melatonin while in Thailand

Store melatonin at room temperature below 25°C, away from humidity and direct sunlight. Hotel rooms in Thailand are typically air-conditioned to 22 to 24°C, which is within the safe storage range. Melatonin tablets degrade faster when exposed to humidity above 60%, and Thailand's average relative humidity exceeds 70% year-round. ^[3]

Keep tablets sealed in the original packaging between doses and avoid leaving them in a bag or room that is not air-conditioned. If you stay in accommodation without reliable air conditioning, store tablets in a sealed, dry container inside the coolest part of the room.^[3]

Emergencies

What to do if something goes wrong with your melatonin in Thailand

If your melatonin is lost, stolen, or damaged, report the loss to local police (191) for an official report, which may be required for a travel insurance claim. Contact your travel insurer using the emergency assistance number on your policy documentation.

If your supply runs out, go directly to a private hospital in Bangkok such as Bumrungrad International (Tel: +66 2 066 8888) or Bangkok Hospital (Tel: +66 2 310 3000). A sleep medicine or neurology physician can assess whether a local prescription medication can be sourced for you. Bring your original packaging, your doctor's letter from home, and your Nomedic record to show the prescribing details.

“ฉันต้องการเมลาโทนิน (Chan tong-kan melatonin) (I need melatonin ฉันมียาที่แพทย์สั่ง (Chan mee ya tee paet sang)) I have a prescribed medication กรุณาโทรหาแพทย์ (Karuna tho-ha paet), Please call a doctor ร้านขายยาที่ใกล้ที่สุดอยู่ที่ไหน (Ran khai ya thi klai thi sut yu thi nai), Where is the nearest pharmacy?”

I need melatonin / I have a prescribed medication / Please call a doctor / Where is the nearest pharmacy?

For medical emergencies in Thailand, call ambulance on 1669 or police on 191.^[6] Private hospitals with 24-hour emergency departments are the most reliable option for English-speaking care.

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Frequently asked questions

Is melatonin legal in Thailand?

Melatonin is legal in Thailand and is not scheduled under the Narcotics Act B.E. 2522 or the Psychotropic Substances Act B.E. 2518. Carry it in original packaging with a doctor's letter and a quantity consistent with your length of stay.

Can I bring melatonin into Thailand?

Yes, you can bring melatonin into Thailand for personal use without an import permit. Keep it in original labelled packaging and carry a doctor's letter naming the medication, dose, and quantity carried.

Do I need a doctor's letter to fly with melatonin to Thailand?

A doctor's letter is not legally required for melatonin entering Thailand, but it is strongly advisable. Melatonin is unfamiliar to some Thai customs officers, and a letter on clinic letterhead naming the INN, dose, and quantity resolves any query quickly.

Is melatonin available at pharmacies in Thailand?

No registered melatonin brand has confirmed Thai FDA approval, so availability in standard Thai pharmacies is unreliable. Some international-facing pharmacies in Bangkok's Sukhumvit area carry unbranded melatonin, but stock is inconsistent; bring your full supply from home.

What if I run out of melatonin in Thailand?

Go to a private hospital in Bangkok with a sleep medicine or neurology department; Bumrungrad International and Bangkok Hospital both have English-speaking physicians who can assess whether melatonin can be sourced locally. Bring your home doctor's letter and original packaging to the consultation.

Is Circadin available in Thailand?

Circadin, the prolonged-release melatonin brand approved in countries including the UK, Germany, France, and Australia, is not confirmed as registered with the Thai FDA and is not reliably available in Thai pharmacies. Bring your full supply of Circadin or the equivalent generic from home.

How much does melatonin cost if I need to buy it in Thailand?

If unbranded melatonin is available at an international pharmacy in Bangkok, expect to pay approximately ฿200 to ฿600 (~$6 to ~$18 / ~€6 to ~€17) for a small pack, though supply is not guaranteed. A private hospital consultation to obtain a prescription and sourced supply costs ฿1,500 to ฿3,000 (~$46 to ~$92 / ~€43 to ~€85).

Melatonin in Thailand: Import Rules, Brands and Pharmacy Access