How to Store Your GLP-1 Medication Properly: Refrigeration, Heat, and Handling Tips

Why Storage Matters More Than You Think

GLP-1 medications like Wegovy (semaglutide) and Zepbound (tirzepatide) are biologic drugs — large, complex protein molecules that are sensitive to temperature, light, and physical handling. Unlike a bottle of aspirin that can sit in your medicine cabinet for years, these medications require specific storage conditions to remain effective. Improperly stored GLP-1 medication may lose potency without any visible change in appearance, meaning you could be injecting a weakened dose without knowing it.

Understanding the storage rules is straightforward, but getting them wrong can be an expensive mistake — each pen costs hundreds of dollars, and your insurance may not cover an early replacement.

Storage Rules Before First Use

When your GLP-1 medication arrives from the pharmacy (or is delivered by mail-order), it must be refrigerated immediately. Here are the specific requirements:

Wegovy (semaglutide)

• Store in the refrigerator at 36°F to 46°F (2°C to 8°C)
• Keep in the original carton to protect from light
• Do not freeze — if accidentally frozen, discard the pen
• Do not store next to the freezer compartment or cooling element where temperatures may drop below 36°F
• Unused pens can be stored in the refrigerator until the expiration date printed on the carton

Zepbound (tirzepatide)

• Store in the refrigerator at 36°F to 46°F (2°C to 8°C)
• Keep in the original carton to protect from light
• Do not freeze — if accidentally frozen, discard the pen
• Unused pens can be stored in the refrigerator until the expiration date on the carton

Storage Rules After First Use (In-Use Pens)

Once you remove a pen from the refrigerator for your first injection, the clock starts ticking. The rules differ slightly between medications:

Wegovy

• Can be stored at room temperature (up to 86°F / 30°C) for up to 28 days
• Each Wegovy pen is a single-dose pen, so you use it once and discard it
• If you take the pen out of the refrigerator, you do not need to put it back — but use it within 28 days

Zepbound

• Can be stored at room temperature (up to 86°F / 30°C) for up to 21 days
• Each Zepbound pen is also a single-dose pen
• Once removed from the refrigerator, use within 21 days

Ideal Refrigerator Placement

Where you place your medication inside the refrigerator matters. Follow these guidelines:

• Store on a middle shelf — this is the most temperature-stable area
• Avoid the back of the refrigerator where temperatures can dip below freezing, especially in older models
• Avoid the door shelves — temperatures fluctuate every time the door opens
• Keep away from the freezer compartment or any cooling vents
• Use a refrigerator thermometer to verify the temperature stays between 36°F and 46°F — many home refrigerators run colder than you think
• Do not place directly on top of ice, ice packs, or frozen items

What to Do If Your Medication Gets Too Warm

If your GLP-1 pen has been exposed to temperatures above 86°F — such as being left in a hot car, sitting on a sunny windowsill, or during a power outage — follow these steps:

• Do not use the pen — there is no way to visually confirm whether the medication has degraded
• Note the duration of exposure and the estimated temperature
• Contact your pharmacist to discuss whether the pen is still usable — short exposures (under 30 minutes) may be acceptable in some cases
• If the pen must be replaced, contact your insurance company about an override for an early refill — most insurers will accommodate documented temperature excursions
• Save the damaged pen in case your insurance requires verification

What to Do If Your Medication Freezes

Frozen GLP-1 medication must always be discarded. Freezing destroys the protein structure of the drug, and even if it thaws and looks normal, it will not work properly. Common causes of accidental freezing:

• Refrigerator set too cold or malfunctioning
• Medication placed too close to the freezer compartment
• Mail-order delivery left outside in winter weather
• Packed with dry ice that contacted the pen directly

If your medication arrived frozen from a mail-order pharmacy, contact the pharmacy immediately. They are required to replace temperature-damaged medications at no cost.

Mail-Order and Specialty Pharmacy Deliveries

Many seniors receive their GLP-1 medications through mail-order or specialty pharmacies, especially when using Medicare Part D. These pharmacies ship medications in insulated packaging with gel packs, but delivery issues can still occur:

• Schedule deliveries for days when someone will be home to receive the package promptly
• In summer, request signature-required delivery so the package is not left in a hot mailbox or on a sun-exposed porch
• In winter, packages left in freezing temperatures for hours can damage the medication
• Inspect the packaging when it arrives — the gel packs should still be cool (not frozen solid or completely warm)
• Most specialty pharmacies include temperature indicators in the packaging — check this before storing your medication

Power Outages and Emergency Situations

A power outage can put your medication at risk. Here is how to handle it:

• Keep the refrigerator door closed — an unopened refrigerator will maintain safe temperatures for approximately 4 hours
• If the outage lasts longer than 4 hours, move your medication to a cooler with ice packs
• Do not place the medication directly on ice — wrap it in a cloth or place it in a sealed bag first
• If you are in a hurricane, flood, or evacuation zone, pack your medication in an insulated travel case as part of your emergency kit
• After power is restored, check the refrigerator temperature with a thermometer before returning medication to it

Light Exposure

Both Wegovy and Zepbound should be protected from direct light. The prescribing information for both medications specifies keeping them in their original cartons until use. Prolonged exposure to sunlight or fluorescent lighting can degrade the medication over time. This is an easy rule to follow — simply leave the pens in the box until injection day.

Quick Reference Storage Chart

• Refrigerator temperature: 36°F to 46°F (2°C to 8°C)
• Maximum room temperature: 86°F (30°C)
• Wegovy room temperature limit: 28 days
• Zepbound room temperature limit: 21 days
• Frozen medication: Always discard
• Light exposure: Keep in original carton

Related Articles

• Traveling With Your GLP-1 Medication: A Complete Guide for Seniors
• How to Give Yourself a GLP-1 Injection: A Step-by-Step Guide
• What Does a GLP-1 Actually Cost on Medicare After July 2026?
• A Week-by-Week Checklist for Your First Month on a GLP-1

Sources

• Novo Nordisk. 'Wegovy (semaglutide) Prescribing Information — Storage and Handling Section.' 2025
• Eli Lilly. 'Zepbound (tirzepatide) Prescribing Information — Storage and Handling Section.' 2025
• U.S. Food and Drug Administration. 'Safe Storage of Biologic Medications.' fda.gov, 2024
• American Pharmacists Association. 'Temperature-Sensitive Medication Handling Guidelines.' pharmacist.com, 2024
• Centers for Medicare & Medicaid Services. 'Mail-Order Pharmacy Requirements for Temperature-Sensitive Drugs.' cms.gov, 2025