Pens travel in your carry-on, never in checked baggage, and they need to stay within their permitted temperature range for the journey. Screening allows medically necessary injectables. The two things that actually go wrong are a bag going into the hold at the gate, and a cool pack that either fails or freezes the pen.
Never put pens in checked baggage. Hold temperatures can fall below freezing, and a frozen pen is unusable even after thawing. Checked bags also get lost. If you are asked to gate-check a cabin bag, take the medication out and carry it with you.
For how this fits into the wider titration picture, see GLP-1 Dosing and Titration: The Complete Guide.
Before you go
Carry the medication in its original box with the pharmacy label showing your name. That label is what makes everything else straightforward, at screening and at borders.
Ask your prescriber for a short letter stating you take an injectable medication and need to carry it with needles. You will probably never be asked for it. On the occasion you are, it turns a difficult conversation into a brief one.
Take more than you need. A delayed return is a common way people end up short, and a spare pen is easier to arrange before you leave than abroad.
Keeping it cold
A medical travel case with a gel pack works for most journeys. The failure mode people do not anticipate is the opposite of the obvious one: a frozen gel pack in direct contact with a pen can freeze it.
Put a layer between the pack and the pen. Wrap the pen, or use a case designed with a separate compartment.
For longer trips, evaporative cooling wallets that activate with water avoid the freezing problem entirely and need no power. They are worth knowing about for anywhere you cannot rely on a fridge.
Hotel minibars run warm and are unreliable. Ask reception for a proper fridge if you need one, which most hotels can arrange.
At the airport
Declare it at screening. Medically necessary liquids and injectables are permitted and are exempt from the ordinary liquid limits, but they need to be declared rather than discovered.
Take them out of your bag and tell the officer what they are. Gel packs are permitted for medical cooling.
Allow extra time. It is usually quick, and occasionally it is not.
Time zones
For a weekly injection this is simpler than people expect. Keep the same day of the week and pick a convenient hour at your destination. A shift of several hours in either direction does not matter for a weekly medication.
Do not compress the interval to make an injection land more conveniently. If the timing is awkward, move it later rather than earlier.
International travel
Rules for carrying prescription medication vary between countries, and a few have restrictions that surprise people. Check the requirements for your destination in advance, particularly for longer stays or unusual destinations.
Keep the original packaging and pharmacy label throughout, and carry the prescriber letter if you have one.
Find out before you go whether the medication is available where you are heading and under what name, in case something goes wrong. Brand names differ between countries.
Sharps
Take a small travel sharps container. Do not put loose needles in hotel bins or luggage. Some destinations have specific disposal requirements, and hotels can often help if you ask.
Never in checked baggage, and mind the cool pack as much as the heat. Storage rules differ by product, set out in storing GLP-1 pens, and quantity limits may need a vacation override arranged in advance.
Frequently asked questions
Can I take pens through security?
Yes, declared, in your carry-on. Medically necessary injectables are permitted.
Do I need a doctor’s letter?
Rarely required, occasionally very useful. Worth having for international travel.
What if my pen gets warm in transit?
Depends on how warm and for how long, against the allowance your product specifies. Ask a pharmacist rather than guessing.
Can I skip a dose while travelling?
Ask your prescriber rather than deciding. There are usually better options than skipping.
What about a road trip?
Keep it in the cabin, not the boot, and never leave it in a parked car in warm weather.
What if I lose my medication abroad?
Contact your prescriber and, if you have it, travel insurance. Knowing the local brand name in advance makes this much easier.