Taking ADHD medication through Singapore, Dubai, Doha or Bangkok

Singapore's Health Sciences Authority (HSA) explicitly exempts direct airside transit from its medication-approval requirement. The HSA personal-medications page states verbatim: 'You do not need an approval from us for carrying personal medications if you are only transiting through Singapore without clearing the Singapore immigration (i.e. staying only within the transit zone).' HSA distinguishes this 'personal medications' category (which includes controlled/prescription-only substances that would otherwise need prior HSA approval to bring into Singapore, e.g. methylphenidate, amphetamine/dextroamphetamine, lisdexamfetamine) from a separate, narrower 'prohibited medications' list, which the same page says remains banned even in the transit zone ('prohibited medications are NOT allowed to be brought in, even if you are not clearing immigration'). Since methylphenidate, amphetamines and lisdexamfetamine sit in Singapore's controlled-but-permit-approvable category (not the outright-prohibited category) for entry purposes, HSA's own transit carve-out applies to them: travellers who stay airside and do not clear immigration do not need the pre-approved HSA permit that would otherwise be required to enter Singapore with these medicines. The page does not enumerate methylphenidate/amphetamine/lisdexamfetamine by name in the transit paragraph itself, so travellers should still keep medication in original packaging with a copy of the prescription as good practice, but no HSA approval/permit is required purely for staying in the transit area of Changi Airport.

If you clear Singapore immigration for a connection or overnight layover (any landside transit), this is legally equivalent to entry. The full HSA prior-approval requirement applies: apply to HSA at least 2 weeks before travel, for up to 3 months' supply.

• Staying airside, never clearing immigration: no approval needed. HSA says no approval is needed if you stay inside the transit zone and never clear immigration. The exception is medicines Singapore prohibits outright, which are cannabis-based; no ADHD stimulant is on that list.
• Clearing immigration for a layover: the full entry rules apply. The transit exemption is written to cover people who stay airside, so clearing immigration puts you back under the full approval requirement.
• Overnight layover, leaving the airport: the full entry rules apply. An overnight stay inside the transit zone still counts as airside. Leaving the airport means clearing immigration, which needs the approval.
• Changing airports: no official guidance found, so assume the full entry rules apply. Not addressed by HSA. Changi's terminals connect airside so this rarely arises.
• Checked bag travelling without you: no official guidance found, so assume the full entry rules apply. Not addressed. HSA's guidance assumes you are carrying the medicine yourself.

The Emirates Drug Establishment says transit passengers who do not leave the airport need no prior approval to carry narcotic and controlled medicines. It still recommends carrying the medicine with its prescription. This is a federal rule, so it covers Dubai and Abu Dhabi equally.

The exemption depends on you not leaving the airport. If you clear immigration, even for a hotel overnight or to change airports, the full entry rules apply: three months' supply at most, a stamped prescription and medical report, and a declaration at the border if you have no pre-approval.

• Staying airside, never clearing immigration: no approval needed. Transit passengers who do not leave the airport need no approval. Carry the medicine with its prescription anyway. This is a federal rule, so Dubai and Abu Dhabi work the same way.
• Clearing immigration for a layover: the full entry rules apply. The exemption depends on not leaving the airport, so clearing immigration brings the full rules back.
• Overnight layover, leaving the airport: the full entry rules apply. Leaving for a hotel breaks the transit exemption.
• Changing airports: the full entry rules apply. Moving between Dubai and Abu Dhabi, or to Al Maktoum, means leaving the airport, so the exemption does not apply.
• Checked bag travelling without you: no official guidance found, so assume the full entry rules apply. Not addressed. Note that UAE residents shipping controlled medicines must hold the permit, which suggests medication arriving without its patient is treated as an import rather than personal luggage.

Qatar publishes nothing about transit passengers carrying controlled medicines through Doha. Its traveller guidance is written for people arriving in or leaving the country and does not mention connections. That is a real difference from the UAE, which does publish an airside exemption, so do not assume Doha works the same way.

If you clear immigration you are an arriving patient under Qatar's rules: clearance from the Pharmacy and Drug Control Department, a stamped medical report or prescription no more than six months old, a personal-use undertaking and a passport copy.

• Staying airside, never clearing immigration: no official guidance found, so assume the full entry rules apply. Qatar publishes nothing about connecting through Doha with controlled medicines. That is a real difference from the UAE, which publishes an explicit exemption, so do not assume Doha works the same way.
• Clearing immigration for a layover: the full entry rules apply. Clearing immigration makes you an arriving patient under Qatar's rules.
• Overnight layover, leaving the airport: the full entry rules apply. Leaving the airport means entering Qatar.
• Changing airports: no official guidance found, so assume the full entry rules apply. Does not arise in practice: Doha International no longer takes scheduled passenger flights.
• Checked bag travelling without you: no official guidance found, so assume the full entry rules apply. Not addressed. Qatar does allow a relative or an authorised person to carry your medicine, with their ID and your written authorisation, which suggests it expects a named human custodian.

Under Thailand's Narcotics Code 2021, controlled medicines that stay on the aircraft are outside 'transit' (section 1). Otherwise, narcotic drugs in transit (amphetamine, dexamfetamine, mixed amphetamine salts, lisdexamfetamine) need a licence from the exporting country and customs custody (section 60), and psychotropic substances in transit (methylphenidate) need a Thai transit licence (sections 35(5), 41 and 42). These are trade-shipment rules with no stated traveller route. Atomoxetine, guanfacine and viloxazine are not controlled.

Landside transit (clearing Thai immigration for a connection or overnight) counts as full entry. Per the Thai FDA's own guidance: methylphenidate (a Category 2 psychotropic substance) can be carried for up to 30 days' supply with only a prescription or medical certificate, no advance permit needed. Lisdexamfetamine, now a Category 2 narcotic drug (reclassified Feb 2025), requires an advance Thai FDA permit (Form IC-2, applied for at least 15 days before arrival, though an older FDA guidance PDF said 2 weeks) for up to 90 days' supply, and must be presented at the red/declare channel. Amphetamine/dextroamphetamine (Category 1 narcotic) is prohibited outright with no personal-use exception, even for entry.

• Staying airside, never clearing immigration: no official guidance found, so assume the full entry rules apply. Medicines that stay on the aircraft are outside 'transit' under the Narcotics Code 2021 (section 1). For a passenger who leaves the aircraft, the Code's transit rules (sections 35(5) and 60) are trade-shipment rules with no stated traveller route.
• Clearing immigration for a layover: the full entry rules apply. Clearing immigration means entering Thailand, so you need the permit before a landside layover.
• Changing airports: the full entry rules apply. Moving between Suvarnabhumi and Don Mueang forces a full clearance, so the entry rules apply.
• Overnight layover, leaving the airport: the full entry rules apply. Leaving the airport means clearing immigration and customs.
• Checked bag travelling without you: no official guidance found, so assume the full entry rules apply. Not addressed. The traveller concessions are written only for medicines carried in person; the guidance prohibits non-exempt narcotics and psychotropics by any route including post, and says nothing about a traveller's own medicine moving without them.