Most travellers carry their medicine in with no trouble — but a handful of ordinary prescriptions are ‘controlled’ or banned here, and a few need a Thai FDA permit arranged before you fly. Here’s the plain-English version: the 30-day personal-use rule, which drugs need a permit, the paperwork to carry, and how to declare. Unbiased, never paid placement — and not a substitute for official guidance.
Bring up to a 30-day personal supply in its original labelled packaging with your prescription and a doctor’s letter. If your drug is a controlled narcotic or psychotropic (strong painkillers, many ADHD stimulants), get a Thai FDA permit before you travel. Check your specific medicine against current Thai FDA guidance — the lists change.
For ordinary prescription and over-the-counter medicines, Thailand generally lets you bring in a reasonable personal supply — the figure travellers and embassies most often cite is up to a 30-day quantity. Carry it in its original pharmacy packaging with the dispensing label intact, plus a copy of your prescription. Bringing markedly more than a personal supply is the line that turns “my medicine” into “importing for supply,” which is treated far more strictly — so if you need a longer run, document it properly or plan to refill in Thailand rather than stuffing a year’s worth in your case.
This is the part that surprises people. Several medicines that are routine at home are classed as Category-2 narcotics or psychotropic substances in Thailand, and bringing them in requires a permit from the Thai Food and Drug Administration (FDA) arranged before you travel:
The permit is typically tied to a 30-day personal supply and takes time to process, so apply well ahead of your flight. If a permit isn’t feasible, ask a Thai hospital about a legal in-country equivalent instead of risking it at the border.
Beyond the permit list, watch for everyday items that are restricted or prohibited:
When in doubt about a specific product, confirm with the Thai FDA or your nearest Thai embassy before departure rather than guessing at the airport.
Keep medicines and documents in your carry-on, never the checked bag — you want them on hand if customs asks, and you don’t want temperature-sensitive drugs in the hold. A letter that uses the generic (international) drug name saves confusion, since brand names vary country to country.
If you’re carrying controlled medication with a permit, or you’re unsure whether something needs declaring, use the “goods to declare” channel and show your paperwork rather than walking through “nothing to declare.” Honest declaration with documents in hand is the safe path; being found with an undeclared controlled drug is the dangerous one. Customs officers deal with travellers’ medicines routinely — a clear prescription, a doctor’s letter and (where needed) a permit make it a quick conversation.
If you’re relocating rather than visiting — on a retirement, LTR or DTV visa — the cleanest plan is usually a 30-day bridge supply with full documentation, then transferring your prescription to a Thai hospital or clinic once you’ve settled. Thailand’s private hospitals are excellent and English-speaking, and many medicines are cheaper and easier to obtain here than at home (often without the prescription hurdles you’re used to). Don’t assume your exact brand exists, though — bring a note of the generic name and dose so a Thai doctor can match an equivalent.
See how the system works in our healthcare & hospitals guide, and what to sort out on arrival in your first 30 days.
The best Bangkok homes put English-speaking hospitals and pharmacies minutes away. Browse areas and residences with care on the doorstep.
General information only — not medical, legal or customs advice. Thailand’s controlled-drug lists, permit rules, personal-import limits and penalties change. Confirm the current rules for your specific medication with the Thailand Food and Drug Administration (อย.), Thai Customs and your nearest Thai embassy or consulate, and consult your doctor before travelling. BAANLYY never takes paid placement.
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.