Thai Pharmacy OTC Guide: What You Can Buy Without Prescription

Boots (Western-style, often inside malls) and Watson's (similar, slightly cheaper) are the two big chains and stock everything from paracetamol to imported sunscreen at Western-style prices — convenient but 20–40% more expensive than independents. The neighbourhood blue-cross pharmacy (the green cross is veterinary in Thailand, not human) is the workhorse: typically a single-shop independent staffed by a licensed pharmacist (look for the diploma displayed behind the counter) who can advise on dosage, interactions, and Thai-brand equivalents. Hours are usually 09:00–22:00, and 24-hour pharmacies exist near major hospitals. Always confirm the pharmacist (not just a counter clerk) is the one selling you anything stronger than basic pain relief.

Paracetamol is sold under brand names Sara, Tylenol, and Tempra (10 THB for a strip of 10x 500mg tablets); ibuprofen is sold as Brufen, Nurofen, or generic ibuprofen (15–25 THB for a strip of 10x 400mg); aspirin is Bayer or generic aspirin (similar prices). Loperamide for diarrhoea is Imodium or generic loperamide (20–40 THB per strip). Oral rehydration salts (ORS) are sold under brand 'ORS' or 'Electrolyte Beverage' (5–15 THB per sachet). Antihistamines: cetirizine (Zyrtec or generic, 30–60 THB for 10 tabs), loratadine (Claritin or generic, similar). PPI for reflux: omeprazole (Losec or generic, 80–150 THB for 14 caps). Topical antifungal cream: clotrimazole (Canesten, 80–150 THB per tube).

Antibiotics are technically prescription-only under Thai law, but many independent pharmacies will sell common ones (amoxicillin, azithromycin, ciprofloxacin, doxycycline) over the counter, particularly to long-term expats or in tourist areas. This is a genuine ethical and public-health gray zone: easy access prevents some delays in treatment but contributes significantly to antibiotic resistance, and pharmacy staff are not qualified to diagnose the underlying infection or pick the right drug. The responsible approach is to get a 1,000–2,000 THB consultation at a private hospital walk-in clinic, get the right prescription, and then fill it at a Thai pharmacy at a fraction of Western prices. Don't self-medicate with antibiotics — it's how resistant Klebsiella ends up in your nose flora.

Melatonin is legal and sold over the counter at Boots, Watson's, and independents in 3mg, 5mg, and 10mg strengths — typically 250–450 THB for a bottle of 60 tabs, much cheaper than the UK where it's prescription-only. Diphenhydramine (Benadryl-style antihistamine sedatives) is sold OTC under various brand names (150–250 THB). Z-drugs (zolpidem/Stilnox, zopiclone/Imovane) are formally prescription-only and controlled — independent pharmacies vary in willingness to dispense without an Rx, and stocking up beyond legitimate personal use risks Customs issues on departure. Benzodiazepines (Xanax, Valium) are firmly prescription-only and controlled — get a real prescription from a Thai psychiatrist if you need them.

Combined oral contraceptive pills are sold over the counter without prescription at almost every Thai pharmacy at remarkable prices — 50–150 THB per 21-day pack depending on the brand, vs 30+ GBP equivalent in some Western markets. Common brands include Yasmin, Diane-35, Mercilon, Microgynon, and Marvelon, all of which are the same formulations available in Europe. The progestin-only pill (mini-pill) is also available OTC. Pharmacists can advise on switching brands, missed pills, and side effects, but cannot perform health screenings — long-term expats should still get an annual GP check, particularly for blood pressure and clotting-risk assessment. Emergency contraception (Postinor, Madonna) is sold OTC and costs around 200–350 THB per dose.

SSRIs, SNRIs, antipsychotics, mood stabilisers, and ADHD medications are formally prescription-only in Thailand and require a script from a Thai-licensed psychiatrist — independent pharmacies will generally not dispense these without an Rx. Bumrungrad, Samitivej, Bangkok Hospital, and BMI Bangkok Mental Health Hospital all have English-speaking psychiatrists. Bring documentation from your home doctor (a letter on letterhead listing diagnosis, medications, doses, and duration of treatment) — this typically allows a Thai psychiatrist to issue a continuing prescription after a 1,500–3,000 THB consultation. Note that some stimulants (ADHD methylphenidate/Ritalin) are tightly controlled and may be hard to get even with documentation; consult before relocating.

Sunscreen is widely sold but most Thai-market formulations are aimed at the local cosmetic preference for skin-whitening — they often contain niacinamide and skin-lightening agents which Western users may not want. Imported European sunscreens (La Roche-Posay Anthelios, Bioderma Photoderm) are sold at Boots, Watson's, and EVE&BOY at 600–1,200 THB per 50ml tube. Thai-brand mineral sunscreens (Cathy Doll, BSC) are 200–400 THB and work fine. DEET-based insect repellent (Sketolene Shield, Soffell) is sold at every pharmacy and 7-Eleven for 80–150 THB — concentrations of 12–25% are common, which is sufficient for tropical Thailand. Picaridin is harder to find — bring from home if you prefer it.

A standard Thai pharmacy traveller's-diarrhoea kit costs around 200–400 THB total: loperamide (Imodium, 30 THB), oral rehydration sachets (5 sachets, 50 THB), bismuth subsalicylate (where available, 100 THB), and activated charcoal tablets (cheap and popular in Thailand, 50 THB). Norit (activated charcoal) is sold OTC and is genuinely useful for mild food poisoning. For persistent diarrhoea beyond 48 hours, go to a hospital — bacterial or parasitic causes need a stool test and targeted antibiotic, not more loperamide. Probiotics (Yakult drinks at 7-Eleven, or Enterogermina sachets at pharmacies) help recovery after a bout.

For temporary tooth or filling-loss issues until you get to a dentist: Dentemp temporary filling material is sold at major pharmacies (250–400 THB per tube), oral analgesic gel (Bonjela equivalent, 80–150 THB), chlorhexidine mouthwash (Listerine variants or Curasept, 150–300 THB), and a strong NSAID like ibuprofen 400mg or naproxen for pain control. Thailand has excellent and very cheap dental care — a temporary filling rarely needs to last more than 24–48 hours before you can see a dentist for 800–2,500 THB to fix it properly. Don't rely on OTC fixes for more than the time it takes to reach a dentist.