storage at a glance
is a temperature-sensitive peptide medication. Improper storage degrades the active ingredient, making injections less effective or completely inactive. The FDA-approved storage rules are specific and worth following exactly.
Before first use — refrigeration
Unopened pens must be refrigerated.
- Required temperature: 36°F–46°F (2°C–8°C) before use
- Storage location: middle shelf of refrigerator (most stable temp). Avoid the door (temp fluctuations from opening) and the back wall (freezing risk).
- Keep in original carton — protects from light, which can degrade the peptide.
- Never freeze — freezing destroys the medication permanently. Discard if accidentally frozen.
After first use — room temperature window
Once a pen is in use, you have a defined room-temperature window before the pen expires:
- Room temperature limit: Per product-specific instructions
- After this period: Per product-specific instructions
Many patients find it easier to label the pen with the date of first use using a permanent marker — track the days from there.
What to do when storage goes wrong
The pen accidentally froze
Discard the pen.Freezing damages the peptide structure of GLP-1 medications, rendering them ineffective or potentially unsafe. Never use a previously- frozen pen even if it looks normal. Don't put pens in the freezer, and avoid refrigerator zones that drop below 36°F (2°C). Check your refrigerator's actual temperature periodically (cheap thermometer ~$10).
You forgot to refrigerate a new pen
Unopened pens left at room temperature should typically be discarded if they were unrefrigerated longer than the manufacturer's allowed room-temperature window. If shorter exposure, remaining usable but consider noting the exposure date and using sooner.
The pen exceeded the room-temperature shelf-life
Discard the pen, even if medication remains visible inside. After the labeled window, stability declines and doses become unpredictable. Doesn't matter if the pen «looks fine» — peptide degradation is invisible.
Power outage with medication in fridge
Keep refrigerator door closed during the outage — most refrigerators maintain temperature for 4-6 hours unopened. If the outage lasts longer than 6-8 hours, or if the medication felt warm to touch when you found it, discard and obtain a replacement through your prescriber.
Pen exposed to high heat (car, sunlight)
High heat exposure (above 86°F / 30°C) accelerates degradation. A pen left in a hot car for hours should be discarded. Brief exposure (under 30 minutes) typically OK but use sooner rather than later.