Can You Bring Medicine on a Plane?

Yes — medications are exempt from the 100 ml liquid rule. You can carry prescription and over-the-counter medicine in your carry-on in quantities needed for your trip, including liquids over 100 ml. Some drugs require documentation and some countries require advance import approval. Here is the complete picture.

Medications and the 100 ml Rule: The Exemption

The standard airport security rule requires all liquids in carry-on bags to be in containers of 100 ml or under. Medications are explicitly exempt from this rule in the US, UK, EU, Australia, Canada, and most other countries.

You can carry a 250 ml bottle of liquid antibiotic, a 200 ml inhaler, or a larger quantity of any liquid medication in your carry-on without it counting toward your 1-litre liquids bag. Declare it separately at security — take it out of your bag alongside your liquids bag when approaching the X-ray machine.

Solid medications (tablets, capsules) have no carry-on restrictions at all, anywhere in the world.

What Documentation to Carry

For standard prescription medications: carry the original pharmacy-labelled packaging with your name, the medication name, and the prescribing doctor's information. This is the most important thing you can have.

For controlled substances (see below): a doctor's letter on headed paper stating your name, diagnosis, medication name, dose, and reason for travel is essential.

For over-the-counter medications: no documentation required, though keeping medications in original packaging is good practice.

Controlled Medications

Controlled substances — opioid painkillers, benzodiazepines (Valium, Xanax), ADHD medications (Adderall, Ritalin), sleep aids, and some others — are subject to additional rules in many countries.

What to carry:

• Original prescription label (your name, medication, dose, prescriber)
• Doctor's letter explaining your condition and why you need the medication
• Keep quantities reasonable — amounts consistent with your trip duration

Country restrictions: some countries restrict or prohibit certain controlled medications entirely. Japan, the UAE, and Singapore all have strict limits on medication types and import quantities. Always check the destination country's import rules before travelling with any controlled substance. Your home country's embassy website or the destination country's customs authority is the best source.

Insulin and Injectable Medications

Insulin, growth hormones, immunomodulators, and other injectable biologics should always travel in carry-on, never in checked luggage. Reasons:

• Cargo holds can reach temperatures of minus 10 to minus 20 degrees Celsius at cruising altitude, cold enough to freeze and permanently damage insulin and many biologics.
• Checked bags can be lost or delayed, leaving you without essential medication.

Insulin pens, vials, and cartridges are all allowed in the cabin. Insulin auto-injectors (disposable pens) are permitted. Declare insulin and needles at security separately.

Refrigerated insulins: if you use insulin that requires refrigeration, carry it in an insulated travel case. Ice packs and gel packs are allowed in carry-on when used to keep medication at temperature — even if partially melted.

Syringes and Auto-Injectors

Needles and syringes are permitted in carry-on with medical documentation. TSA requires a prescription label or doctor's letter confirming medical necessity. Most other countries follow the same principle.

Keep needles capped and pack them accessibly. Declare them at the checkpoint before screening. Loose uncapped needles may cause delays or be confiscated.

EpiPens (adrenaline auto-injectors): always carry in the cabin. EpiPens are allowed without restriction in carry-on in the US, UK, EU, Australia, and Canada. Carry a spare if prescribed. Security staff are familiar with EpiPens — brief them as you approach the X-ray belt.

CPAP Machines

Continuous positive airway pressure (CPAP) machines are allowed in carry-on and do not count against your carry-on allowance on most major airlines. TSA treats CPAP machines as medical devices, not as part of your bag allowance.

Remove the CPAP from its case and place it in a separate tray during X-ray screening, similar to a laptop. Carry a copy of your prescription or doctor's note if asked.

CPAP water: distilled water for the humidifier is allowed in carry-on in quantities over 100 ml when clearly associated with the CPAP device and declared at security.

Key Medical Items and Carry-On Status

Item	Carry-On Allowed	Notes
Prescription tablets/capsules	Yes	No restriction on quantity
Liquid medication over 100 ml	Yes	Declare at security; exempt from liquids rule
Insulin (all types)	Yes	Never check; carry insulated if refrigerated
EpiPen / auto-injector	Yes	Always cabin; carry spare
Syringes/needles	Yes	With prescription or doctor's letter
CPAP machine	Yes	Does not count against carry-on allowance
Ice packs for medication	Yes	Allowed even if partially melted
Controlled substances	Yes	Carry prescription label and doctor's letter

Tips for Travelling with Medication

• Carry enough medication for the full trip plus a few extra days, in case of delays.
• Split medication between carry-on and a travel companion's bag when possible, so a lost bag does not mean total loss.
• Research destination country laws for any controlled substance — penalties for non-compliance can be severe.
• TSA Cares (in the US) offers a helpline and passenger support for travellers with medical needs.