How long can semaglutide stay out of the refrigerator?
Once in use, an Ozempic or Wegovy pen is good for 56 days at room temperature (under 86°F). Unused pens must stay refrigerated. The full storage rules.
Updated May 6, 2026 · 4 min read
Once you've used a semaglutide pen for the first time, it's good for 56 days at room temperature (anywhere under 86°F / 30°C). Unused pens — the ones you haven't injected from yet — need to stay refrigerated between 36–46°F (2–8°C). After 56 days from first use, or if exposed to temperatures above 86°F, throw the pen out.
This is per Novo Nordisk's labeling for both Ozempic and Wegovy, which use the same pen device.
The exact rules at a glance
| State | Storage requirement | Maximum duration |
|---|---|---|
| Unused pen (never injected) | Refrigerator (36–46°F / 2–8°C) | Until expiration date on box |
| Unused pen at room temp | Below 86°F (30°C) | Up to 56 days, then discard |
| In-use pen (after first injection) | Either fridge OR room temp | 56 days from first use |
| Exposed to >86°F | — | Discard immediately |
| Frozen | — | Discard immediately |
Two important nuances:
- The 56-day clock starts at first injection, not when the pen leaves the fridge. If you store it at room temp from day one, you still get 56 days from your first dose.
- Don't refreeze. If a pen has been frozen — even briefly, even unintentionally (back of the fridge gets cold) — discard it. Freezing damages the protein structure.
Why these limits exist
Semaglutide is a peptide, and peptides are fragile. Heat denatures them; freezing crystallizes the solution. Below 86°F, the molecule is stable enough for two months of weekly use. Above that, you can't reliably predict how much active drug remains — which means injecting an uncertain dose.
The 56-day limit isn't arbitrary. It's based on the manufacturer's stability testing showing potency stays within spec for that window. After 56 days you might still get some semaglutide effect, but you can't trust the dose, which defeats the point of careful titration.
Travel and short trips
For a 2–4 hour trip in a cool bag with an ice pack: fine. The pen tolerates temperature fluctuations within the safe range.
For longer travel, a few practical rules:
- Use an insulated cooler bag with a small ice pack for trips longer than 4 hours, especially in hot weather. Don't let the pen touch the ice pack directly — wrap it in a small cloth or paper towel to avoid freezing.
- TSA allows medication and ice packs through security. You don't need a doctor's note, but bringing one (or your prescription bottle/box) avoids hassle.
- Hotel mini-fridges work for storage at most temperatures. Verify they're not freezing your pen — some run colder than 32°F.
- Don't leave a pen in a parked car in summer or winter. Cars hit dangerous temperatures fast in either direction.
For international travel and longer trips, see our GLP-1 travel guide cluster for tips on supply, refilling abroad, and what to do if a pen gets compromised.
Compounded semaglutide is different
If you're using compounded semaglutide (a vial of dry powder reconstituted with bacteriostatic water), the storage rules change:
- Unreconstituted (dry) vial: room temperature is usually fine; check your pharmacy's specific guidance.
- Reconstituted vial: must stay refrigerated. Most compounding pharmacies recommend using within 28–35 days of reconstitution; verify with your supplier.
- Reconstituted vial out of the fridge: generally not recommended for more than 2–3 hours. Compounded preparations have less stability data than the brand pens.
If your compounded vial gets warm or you're unsure, ask your compounding pharmacy directly. They'll usually replace a compromised vial. Our compounded semaglutide safety cluster covers what to look for.
What to do if a pen got too warm
If your pen sat in a hot car for an hour, on a sunny windowsill all afternoon, or got left out at a beach picnic:
- Check the solution. It should be clear and colorless. Cloudy, discolored, or particle-containing solution means discard.
- Read the temperature exposure honestly. Brief warm-up (under an hour, under 86°F) is usually fine. Sustained heat over 86°F means discard.
- When in doubt, throw it out. A discarded pen costs you a week's progress; an underdosed injection from a degraded pen costs you weeks of titration work plus possible illness from carrier preservatives that may break down differently.
Common related questions
Can I take semaglutide out of the fridge an hour before injecting to reduce sting? Yes — this is actually recommended by most prescribers and by Novo Nordisk. Cold solution stings more on injection. 30–60 minutes at room temp before injecting is fine.
What if I've been keeping my pen in the fridge the whole time? Totally fine — and probably extends pen stability slightly. Cold storage doesn't shorten the 56-day in-use window.
My pen has been out of the fridge for 14 days but I haven't used it. If it's been continuously below 86°F, you're still well within the 56-day room-temp window. Use it normally.