How to Store Your GLP-1 Pen: A Complete Guide

GLP-1 medications are biological drugs — they contain protein-based compounds that are sensitive to temperature extremes. A pen that's been frozen or left in a hot car may still look identical to a correctly stored one, but its effectiveness could be significantly reduced or eliminated. Understanding storage requirements protects your investment and your treatment outcomes.

Standard Storage Requirements

• Before opening (unopened pens): Refrigerate at 2–8°C (36–46°F) — typically the door shelf of your fridge
• After opening (in-use pen): Store at room temperature — below 30°C (86°F) for most brands — for up to 28–56 days depending on the medication
• Never freeze: Freezing irreversibly damages the protein structure of the medication
• Protect from direct sunlight: UV exposure degrades the active compound
• Keep the cap on: Protects the needle tip and prevents contamination

Brand-Specific Storage Differences

• Ozempic (semaglutide): Unopened — refrigerate. In use — room temp up to 30°C for 56 days
• Wegovy (semaglutide): Unopened — refrigerate. In use — room temp up to 30°C for 28 days
• Mounjaro / Zepbound (tirzepatide): Unopened — refrigerate. In use — room temp up to 30°C for 21 days
• Saxenda (liraglutide): In use — room temp up to 30°C for 30 days. Check your specific pack leaflet

Signs Your Pen May Be Compromised

• Cloudy, discoloured, or particulate-containing liquid — GLP-1 solutions should be clear and colourless
• Pen was exposed to freezing temperatures (accidentally left outdoors in winter or in the freezer)
• Pen was left in a car in summer heat (car interiors can reach 50–60°C)
• Liquid looks 'chunky' or has visible clumping
• Unexpected loss of appetite control or effectiveness — though this is hard to attribute conclusively

Travelling with Your GLP-1 Pen

• Always carry your pen in your hand luggage — cargo holds can freeze at altitude
• Use an insulated travel case (Frio wallets are designed for injectable medications)
• On hot trips: keep the pen in your hotel room's fridge or a cool bag with an ice pack (don't let it touch ice directly)
• For long trips abroad: carry enough supply plus a buffer — sourcing GLP-1 medications internationally can be difficult
• Carry your prescription documentation when crossing borders

Disposing of Used Pens Safely

Used GLP-1 pens contain a needle and should be disposed of in a sharps container, not a standard bin. Pharmacies, GP surgeries, and hospitals typically accept sharps containers. Do not recap and throw away in general waste — needle stick injuries are a genuine risk.