Flying with medication: what security can and cannot take from you

Guide · Health

Here is the foundation everything else sits on: medically necessary items — including liquids over 3.4 oz — are exempt from the standard limits at TSA and CATSA checkpoints. Pills have no quantity cap at all. What changes the experience from smooth to miserable is not the rules; it is how you present them.

The checkpoint script, in order

1. Before bins, tell the officer: “I have medically necessary liquids / injectables to declare.” One sentence changes everything.
2. Keep medication in a separate, easily removable pouch — not buried under clothing.
3. Keep pharmacy labels on. TSA does not legally require them domestically, but labeled bottles end conversations before they start, and many foreign customs authorities do require them.
4. Liquids may be opened for testing. Sealed accessories stay sealed if you ask for alternate screening.
5. Insulin pumps and CGMs: many manufacturers say their devices should not go through X-ray or body scanners — you may request a pat-down instead.

Packing rules that protect the medicine itself

Medication never goes in checked luggage if losing it would hurt you: holds stray outside safe temperatures, bags get lost, and you want a buffer for delays. Pack double your expected need, split between two cabin bags. Cooling is your responsibility — crew refrigerators are off-limits, so gel packs in an insulated pouch are the standard play; both US and Canadian screening explicitly allow medically necessary cooling packs when declared. Injectables (insulin, GLP-1 medications like Zepbound or Ozempic) plus their needles are permitted together in the cabin.

The part security cannot help you with: foreign law

Screening officers decide what leaves the airport; your destination decides what enters the country. A medication that is over-the-counter in Canada can be controlled in Japan or banned in the UAE. For controlled substances (ADHD stimulants, opioids, many sleep and anxiety medications), check the destination country’s embassy or health ministry page before departure, carry a signed doctor’s letter listing generic drug names, and keep everything in original packaging. Medical cannabis deserves special caution: even between two legal jurisdictions, crossing borders with it is routinely illegal.

When in doubt, the fastest answers come from our medicine item page, your pharmacist, and your airline’s special-assistance desk — in that order.

Sources: TSA Special Procedures · CATSA. Last verified 2026-07-30.