Storing and Travelling With a GLP-1

Storing and travelling with a GLP-1 pen requires a little planning — but it's straightforward once you know the rules. Before first use, pens should be stored in the refrigerator. Once in use, most tolerate room temperature for a limited period. The exact limits vary by product — your product leaflet is the definitive reference.

Before first use: refrigerator storage

All GLP-1 pens should be stored in the refrigerator before first use:

• Temperature: 2–8°C (36–46°F)
• Keep them away from the freezer compartment — do not freeze
• Keep them away from direct light inside the fridge
• Do not store in the fridge door (temperatures are less stable there)

When collecting a prescription, if you have a journey of more than 30–60 minutes in warm weather, keep the pen in a cool bag for transit.

After opening: room temperature window

Once a pen has been started (first use), it can generally be kept at room temperature for a limited period. This window varies by product — check your specific product leaflet for the exact duration and temperature limit.

If you need to return the in-use pen to the fridge for any reason (e.g. travel with a cool bag), most products permit this — but again, check your product-specific instructions. Do not re-freeze a pen that has been at room temperature.

How to travel with a GLP-1

Travelling domestically or internationally with a GLP-1 pen is manageable with a little preparation:

• Carry in hand luggage — never put in checked baggage. Aircraft cargo holds can experience extreme temperatures that can damage the medication
• Use a cool bag or medical travel wallet — insulated pouches designed for injectable medications are widely available and keep the pen at the right temperature without active refrigeration for several hours
• At security — injectable medications are generally permitted in hand luggage beyond the liquid limit. Carrying a letter from your prescriber (or the prescription label) helps at security and customs
• At your destination — ensure access to a fridge at your hotel or accommodation. Most hotels will store medication in their fridge on request
• Check destination regulations — some countries have specific rules about controlled substances and injectable medications. Check before you travel, particularly for non-EU/US destinations

For trips within a few hours of home, a good-quality insulated cool bag with a gel ice pack is sufficient. For longer journeys, a medical-grade travel cooler that maintains 2–8°C is a more reliable option.

Heat, cold and light exposure

The three environmental risks to a GLP-1 pen are heat, freezing, and direct light exposure:

• Heat — temperatures above the recommended room temperature limit can degrade the active ingredient. Never leave a pen in a car in warm weather, in direct sunlight, or in any environment that gets hot. This includes car gloveboxes, windowsills, and beach bags left in the sun
• Freezing — a frozen pen should not be used. Freezing damages the medication. If a pen accidentally freezes, contact your pharmacist before using it
• Light — keep pens in their original packaging or cap when not in use. Most pens are designed to protect the medication from light, but prolonged direct sunlight exposure is not advisable

If you're unsure whether your pen has been stored correctly — for example after a travel delay or power outage — contact your pharmacist. It's not worth risking a compromised dose.

Frequently asked questions

Can I leave my GLP-1 pen out of the fridge?
In-use pens generally tolerate room temperature for a limited period — but this varies by product and formulation. Check your specific product leaflet for the exact window. Never leave a pen in a hot car or in direct sunlight.

What happens if my pen gets too warm?
Excessive heat can degrade the medication, reducing its effectiveness. If you suspect a pen has been exposed to temperatures above the recommended range, contact your pharmacist before using it.

Can I travel internationally with a GLP-1?
Yes, but plan ahead. Keep pens refrigerated or in a cool bag. Carry them in your hand luggage rather than checked baggage (which can experience extreme temperatures). Check the regulations for your destination country and airline. A letter from your prescriber can help at customs.

What should I do if my pen accidentally froze?
Do not use a frozen pen. Freezing can damage the medication. Contact your pharmacist — they can advise on replacement and whether the pen is safe to use.