6 min read · May 2026
How to Store Your GLP-1 Medication in Summer Heat
Critical: Semaglutide degrades above 86°F (30°C). Tirzepatide has similar limits. A car interior can exceed 150°F in 30 minutes. Proper storage isn't optional — it determines whether your medication works.
Summer heat is the invisible enemy of GLP-1 medications. Peptide drugs are temperature-sensitive proteins that lose potency when exposed to heat — and unlike an antibiotic that just expires faster, a degraded GLP-1 may provide no therapeutic effect at all while still causing side effects.
Storage Temperatures by Medication
| Medication | Refrigerated | Room Temp (in-use) | Max Temp | In-Use Limit |
|---|---|---|---|---|
| Wegovy (semaglutide pen) | 36-46°F (2-8°C) | Up to 86°F (30°C) | 86°F | 28 days |
| Zepbound (tirzepatide pen) | 36-46°F (2-8°C) | Up to 86°F (30°C) | 86°F | 21 days |
| Compounded sema (vial) | 36-46°F (2-8°C) | Varies by pharmacy | Per label | Per label |
| Oral Wegovy (pill) | Not required | Room temperature | 86°F | Per expiration |
Summer Danger Zones
Parked cars: Interior temperatures reach 120-150°F within 30 minutes on a 90°F day. Never leave medication in a parked vehicle — not even "just for a minute."
Mailboxes: If your medication ships to your home and sits in a metal mailbox in direct sun, temperatures can exceed safe limits. Schedule deliveries when you'll be home, or use a shipping locker.
Outdoor events: Beach days, cookouts, sporting events. If you carry a pen for your weekly injection, it needs a cooled case — not your pocket or a beach bag in the sun.
Power outages: Summer storms knock out power. If your refrigerator is off for more than 4-6 hours, your medication may have exceeded safe temperatures. Check with your pharmacy about replacement policies.
Cooling Solutions
FRIO wallets use evaporative cooling and maintain safe temperatures for 24-48 hours without ice or electricity. Reactivate by soaking in water.
Insulated medication travel cases with gel packs maintain 36-46°F for 8-12 hours. Good for day trips.
Mini portable coolers (USB-powered) maintain precise temperatures indefinitely. Best for extended travel.
How to Tell If Your Medication Was Heat-Damaged
Unfortunately, there's often no visible sign. The solution may look identical but have reduced potency. If your medication was exposed to temperatures above 86°F for more than a few minutes, contact your pharmacy about replacement. Don't assume it's fine — the cost of a wasted month of reduced-potency medication exceeds the cost of a replacement vial.
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- Novo Nordisk. Wegovy Prescribing Information: Storage and Handling. 2024.
- Eli Lilly. Zepbound Prescribing Information: Storage. 2024.
- USP. Temperature guidelines for pharmaceutical storage. Chapter 659.
Medical Disclaimer: This content is for informational purposes only and is not medical advice. Consult a licensed healthcare provider before starting, stopping, or changing any medication.
FDA Notice: Compounded medications referenced in this article are not FDA-approved. Only brand-name GLP-1 medications (Wegovy, Zepbound, Ozempic, Mounjaro) carry FDA approval for their indicated uses.