Dupixent can safely stay out of the refrigerator for up to 14 days at room temperature (up to 77°F or 25°C), which gives you a generous window for most trips. The key challenges are keeping it cool enough, getting it through airport security, and having the right paperwork for international travel. With a little planning, none of these are difficult.
The 14-Day Room Temperature Window
Dupixent is normally stored in the refrigerator, but the manufacturer allows it to remain at room temperature for up to 14 days as long as the temperature stays at or below 77°F (25°C). After 14 days outside the fridge, unused syringes or pens must be discarded. That means for a trip under two weeks, you may not even need a cooler if your hotel room or destination stays comfortably below that threshold. For longer trips or warm climates, you’ll need a way to keep it cold.
Two things can permanently ruin a dose: freezing and heat. If a syringe freezes, it should not be used. If it sits above 77°F for any period, it’s no longer reliable. Direct sunlight is also a problem. Keep your syringes in the original carton, which blocks light and provides some insulation.
Choosing a Travel Cooler
Soft-sided insulated bags and pouches are convenient but lose their cool quickly. If your travel day is longer than a few hours, a rigid cooler performs significantly better. Styrofoam coolers with walls at least 1.5 inches thick can maintain safe temperatures for much longer and still fit within standard carry-on size limits. One well-tested setup uses a foam cooler paired with 32-ounce gel packs, which can hold temperature for around 30 hours even at ambient temperatures between 72°F and 82°F, and closer to 40 hours in cooler environments.
The critical detail is preventing the gel packs from touching your syringes directly. Frozen gel packs can freeze the medication on contact. Cut a thin foam sheet (quarter-inch polyethylene works well) to fit between the packs and your Dupixent. Some travelers use a small towel or washcloth for the same purpose.
Battery-powered portable refrigerators designed for biologics are another option. These plug into a USB power source and can actively cool during long flights or layovers. Some models also include a non-electric gel pack mode as a backup. They cost more than a foam cooler but remove the guesswork on longer travel days.
Getting Through Airport Security
TSA allows medically necessary liquids, gels, and aerosols in quantities that exceed the standard 3.4-ounce limit. Dupixent syringes and pens fall under this category. You do need to declare them at the security checkpoint by telling the officer you’re carrying injectable medication. Gel packs used to keep the medication cool are also permitted as medically necessary items.
TSA recommends (but does not require) that medications be labeled. Having the pharmacy label on the original carton is the easiest way to satisfy this. If you’ve removed syringes from the carton, carrying your prescription or a copy of it helps speed things along. In practice, TSA officers see injectable medications regularly, and the process is usually quick.
Pack your cooler so it’s easy to open and show at the checkpoint. Keeping it in your carry-on rather than checked luggage is important for two reasons: you can monitor the temperature, and the cargo hold of a plane can drop below freezing.
Documentation for International Travel
Crossing international borders with injectable medication requires more preparation than domestic flights. At a minimum, carry a letter from your prescribing doctor that explains your condition, confirms the medication is medically necessary, and is written in English. A copy of your prescription serves as a backup.
U.S. Customs and Border Protection advises keeping medication in its original container with the doctor’s instructions printed on the packaging. If you don’t have the original container, the doctor’s letter becomes essential. Carry only enough medication for personal use during your trip.
For countries outside the U.S., requirements vary. Some nations require prescriptions to be notarized or translated into the local language. Others restrict the import of any injectable without advance approval from their health ministry. Check with the embassy or consulate of your destination country before you leave. Your specialty pharmacy can sometimes help with this, since they regularly assist patients who travel with biologics.
Packing and Planning Tips
Start your 14-day clock deliberately. If you remove Dupixent from the fridge the morning of your flight, you have the full two weeks before it expires at room temperature. Write the date you took it out on the carton so you don’t lose track.
If your trip is longer than 14 days, you’ll need access to a refrigerator at your destination. Most hotels can store medication in their kitchen or lobby fridge if you ask the front desk. Vacation rentals with a kitchen fridge are even simpler. Some travelers arrange with their specialty pharmacy to ship a dose directly to their hotel, timed to arrive when they do.
Bring one more dose than you think you’ll need. Flights get delayed, trips get extended, and a syringe can break. Having a backup prevents a missed dose from derailing your treatment. If your injection schedule falls during the trip, factor in a few minutes of private time. Dupixent should sit at room temperature for 30 to 45 minutes before injection to reduce discomfort, so plan around that.
For sharps disposal while traveling, a small hard-sided container (even a thick plastic bottle with a screw cap) works as a temporary sharps container until you can dispose of it properly at home or at a pharmacy.
Road Trips and Warm Climates
Car travel introduces temperature spikes that air travel usually doesn’t. A parked car in summer can reach well over 100°F in minutes, so never leave Dupixent in the vehicle. Keep your cooler in the air-conditioned cabin with you. If you’re stopping for meals or sightseeing, bring it inside.
In tropical or desert destinations where outdoor temperatures regularly exceed 77°F, a passive cooler with gel packs may not last as long as expected. Refreshing the gel packs by refreezing them at your hotel each night extends their life for the next day’s travel. A battery-powered cooler provides more consistent protection in these conditions but needs charging overnight.