Medically reviewed by a licensed healthcare professional. Last updated March 2026.
The Short Answer
Yes, semaglutide (Ozempic and Wegovy) must be refrigerated before first use. After first use, the rules differ between the two medications. Proper storage is not just about following the rules. Semaglutide is a biologic peptide that degrades when exposed to heat, freezing, or prolonged room temperature storage. Using improperly stored medication may mean you are injecting a less effective or inactive product.
Storage Rules by Product
Ozempic (Multi-Dose Pen)
| Storage Phase | Temperature | Duration |
|---|---|---|
| Before first use | 36 to 46 degrees F (2 to 8 degrees C) | Until expiration date |
| After first use | 59 to 86 degrees F (15 to 30 degrees C) OR refrigerated | Up to 56 days (8 weeks) |
| After 56 days | Discard regardless of remaining medication | N/A |
After your first injection from an Ozempic pen, the clock starts ticking. You have 56 days to use the remaining doses, whether you store it in the fridge or at room temperature. Most patients go through a pen in 4 to 8 weeks depending on their dose, which fits within this window.
Wegovy (Single-Dose Pen)
| Storage Phase | Temperature | Duration |
|---|---|---|
| Before use | 36 to 46 degrees F (2 to 8 degrees C) | Until expiration date |
| At room temperature (unrefrigerated) | Up to 77 degrees F (25 degrees C) | Up to 28 days |
Wegovy pens are single-use, so there is no "after first use" scenario. However, if you need to store them outside a refrigerator (for travel, for example), they remain stable for up to 28 days at or below 77 degrees F. This is a stricter temperature limit than Ozempic's 86 degrees F.
Critical Temperature Warnings
Do not freeze semaglutide. Freezing destroys the molecular structure of the peptide. If your pen has been frozen, even briefly, discard it. Do not attempt to thaw and use it. This applies even if the solution looks normal after thawing.
Do not expose to temperatures above 86 degrees F (30 degrees C). A car dashboard in summer, a mailbox in direct sunlight, or a bag left on a hot beach can easily exceed this threshold within minutes. Once semaglutide has been heat-damaged, the degradation is irreversible.
Do not expose to direct sunlight. UV radiation accelerates peptide degradation even at otherwise acceptable temperatures.
Keep the pen cap on when not in use. The cap protects the medication from light exposure.
How to Tell If Your Semaglutide Has Gone Bad
Unfortunately, degraded semaglutide often looks identical to fresh medication. The solution remains clear and colorless even after significant potency loss. There is no reliable visual test.
Signs that you should discard a pen:
- The solution appears cloudy, discolored, or contains visible particles
- The pen was exposed to temperatures above 86 degrees F or below 32 degrees F
- The pen has exceeded its in-use expiration (56 days for Ozempic, 28 days unrefrigerated for Wegovy)
- The pen was left out of the refrigerator for an unknown duration
If you suspect your medication has been compromised, the safest approach is to discard the pen and use a new one. Contact your pharmacy about replacement options.
Traveling with Semaglutide
TSA Rules for Flying
Injectable medications are explicitly permitted through TSA security checkpoints. Semaglutide pens do not need to fit in your quart-size liquids bag. Here is what you need to know:
- Declare your medication to the TSA officer at the security checkpoint. You can say, "I have injectable medication."
- Keep medication in its original packaging with the pharmacy label visible. This is not legally required, but it prevents delays and questions.
- Needles are permitted when accompanied by the injectable medication they are used with.
- Cooling packs are allowed. Both frozen and liquid cooling gel packs are permitted in carry-on bags when used to keep medication cool.
- No prescription letter is required for domestic flights. For international travel, carry a letter from your prescriber.
Packing Tips
Always carry semaglutide in your carry-on bag. Checked luggage goes through cargo holds that can reach temperatures well below freezing. A frozen pen is a ruined pen.
Use an insulated medication travel case. These cases maintain temperature for 12 to 24+ hours depending on the model. Popular options include:
- FRIO cooling wallets: Activated by water, reusable, no ice or refrigeration needed. They use evaporative cooling to keep medication below 79 degrees F for up to 45 hours. Cost: about $20 to $40.
- MedAngel temperature monitors: A Bluetooth sensor that alerts your phone if your medication goes out of range. Cost: about $30.
- Standard insulated pouches with gel packs: Affordable and effective for shorter trips. Wrap the gel pack in a cloth to prevent the pen from touching it directly (to avoid accidental freezing).
Road Trips and Hot Climates
If you are driving in warm weather, never leave your medication in the car. Car interiors can reach 140+ degrees F in direct sunlight. Use a cooler with ice packs, but place a towel or barrier between the medication and the ice to prevent freezing.
For extended stays in hot climates without reliable refrigeration, FRIO wallets are the most practical solution since they only need water to reactivate and do not depend on access to ice or electricity.
Hotel Storage
Most hotel rooms have a mini-fridge. Place your semaglutide on a shelf in the fridge, not in the freezer compartment. Mini-fridges can sometimes run colder than expected near the cooling element, so avoid placing the pen directly against the back wall.
If there is no fridge in your room, request one from the front desk. Hotels are generally accommodating when you explain it is for medication storage.
Compounded Semaglutide Storage
If you are using compounded semaglutide (from a compounding pharmacy), storage requirements may differ from brand-name Ozempic or Wegovy. Compounded formulations often have shorter shelf lives and may require continuous refrigeration. Always follow the specific storage instructions provided by your compounding pharmacy.
Common compounded semaglutide storage requirements include refrigeration at all times, a use-by date of 28 to 90 days from compounding, and no room-temperature storage. Ask your pharmacy for their specific guidance.
Quick Reference
| Scenario | What to Do |
|---|---|
| Pen left on counter overnight (room temp ~70 degrees F) | Still fine. Resume refrigeration. |
| Pen left in hot car for 2+ hours | Discard. Heat damage is irreversible. |
| Pen fell and you are unsure if it cracked | Inspect for leaks or cracks. Discard if damaged. |
| Pen was frozen in the back of the fridge | Discard. Do not thaw and use. |
| Traveling for less than 28 days | Wegovy can stay at room temp (under 77 degrees F). Use a cooling case in hot weather. |
| Power outage | Move pen to a cooler with ice packs. If power returns within a few hours, pen is likely fine. |
Ready to start your weight loss journey? Find a GLP-1 clinic near you and connect with a qualified provider today.
Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Individual results vary. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you are experiencing a medical emergency, call 911.