How Long Does Compounded Semaglutide Last in the Fridge? (2026 Storage Guide)
Your medication arrives, you put it in the fridge, and then you wonder: how long is this actually good for? The short answer is that your pharmacy's label is the authority — but understanding what that label means, and what to do when something goes wrong, makes the whole thing far less stressful. Here is a clear, practical guide to everything storage-related.
† Storage requirements for compounded medications vary by pharmacy, formulation, and additives. The instructions printed on your prescription label and provided by your compounding pharmacy take precedence over anything in this article. When in doubt about a specific vial, contact your pharmacy rather than guessing.
Key takeaways
Compounded semaglutide is generally stored refrigerated between 36°F–46°F (2°C–8°C). Never freeze it.
Your vial carries a beyond-use date (BUD) set by the pharmacy that compounded it. That date, and any post-opening window on your label, are the ones that apply to your medication.
If your medication has been left out, frozen, or exposed to heat, contact your pharmacy before using it. Degradation is not visible, so you cannot assess it by looking.
When traveling, use an insulated medication cooler and keep the medication in carry-on baggage — never checked luggage.
The correct storage temperature
Semaglutide is a peptide — a chain of amino acids — and peptides are sensitive to heat, light, and freezing. Compounded semaglutide is generally stored at 36°F to 46°F (2°C to 8°C), standard refrigerator temperature. Confirm the range on your own label, since compounded formulations can differ.
Key storage practices
Do: Store in the main body of the refrigerator, not the door — door temperatures fluctuate every time it opens. Keep the vial in its original packaging to limit light exposure. Store upright where practical.
Do not: Freeze the vial. Store in direct sunlight. Place it against the refrigerator's cooling element or next to a freezer compartment, where localized freezing can occur.
Beyond-use dates: what they are and why yours is specific to you
Your vial will have a beyond-use date (BUD) printed on the label by your compounding pharmacy. This is the date after which the pharmacy does not consider the preparation suitable for use.
BUD is not the same as an expiration date
An expiration date on an FDA-approved manufactured product reflects extensive stability testing on a standardized formulation. A beyond-use date on a compounded preparation is assigned by the compounding pharmacy under USP standards for sterile compounding, based on the specific formulation, container, and conditions. BUDs are typically much shorter than manufacturer expiration dates.
Because BUDs depend on the individual preparation, there is no universal number — not for compounded semaglutide generally, and not across different pharmacies. Any article quoting a standard shelf life is describing a generalization, not your vial. Use the date on your label.
Do not use medication past the BUD on your label, regardless of how it looks. Peptide degradation is not reliably visible — a degraded solution can appear identical to a stable one.
After you open the vial
Once the stopper has been punctured for a first draw, a different and usually shorter window applies. Your pharmacy sets that window and should state it on the label or in the accompanying instructions. Follow it.
Two things drive the shorter post-opening window: each needle puncture carries some contamination risk, and stability after opening can differ from stability in a sealed container.
Practical tip
Write the date you first punctured the vial directly on the label. It takes five seconds and removes any guesswork later — particularly if your dose changes mid-vial and you end up using it more slowly than expected.
What to do if it gets left out, overheated, or frozen
This is the most common question patients have, and the honest answer is that it depends on the formulation, the temperature, and how long — which is exactly why it is a question for your pharmacy rather than an article.
If the vial was left at room temperature
Do not assume it is fine, and do not assume it is ruined. Note roughly how long it was out and at what temperature, then contact your compounding pharmacy. They know the formulation, its additives, and its tested stability, and can tell you whether it remains usable. Guidance written for brand-name pen products does not transfer to compounded vials.
If the vial was exposed to high heat
Left in a hot car, near a heat source, or in a delivery that sat outside in summer temperatures — contact your pharmacy before using it. Heat accelerates peptide degradation, and there is no visual check that reliably tells you whether potency has been lost.
If the vial was frozen
Do not use it. Freezing can permanently alter peptide structure, and a frozen-then-thawed vial may look completely normal while no longer being reliable. Contact your pharmacy or Ondra support about a replacement.
If a shipment arrives warm, without intact cold packaging, or visibly damaged, contact support before using any of it — that is what the replacement process exists for.
Traveling with compounded semaglutide
Injectable medications are treated as medical liquids by TSA and are exempt from the standard 3.4 oz (100 ml) carry-on liquid limit. Declare your medication and any cooling supplies at the checkpoint, and check TSA.gov for current rules before you travel.
Keeping it cold in transit
An insulated medication cooler with a gel ice pack works for shorter journeys — place a cloth or paper barrier between the vial and the ice pack so it cannot freeze. For longer trips or destinations without reliable refrigeration, evaporative cooling cases and powered medical travel coolers are both options. Cooling performance varies considerably by product, ambient temperature, and humidity, so check the manufacturer's stated temperature range and duration against your actual itinerary.
Two rules that matter most
Carry-on only. Never place medication in checked baggage — cargo holds are not temperature controlled and can freeze or overheat it.
Refrigerate on arrival. Store the vial in a refrigerator as soon as you reach your destination, keeping it away from any freezer compartment.
For international travel, carry a copy of your prescription or a provider letter, and research your destination's rules on compounded medications before departing.
Visual signs to watch for
Do not use the vial if you notice
Visible particles or cloudiness in a solution that should be clear. Unusual discoloration. Crystalline material that does not redissolve. Damage to the vial or stopper. Or simply: any uncertainty about how it has been stored.
The important caveat is that a normal appearance does not confirm the medication is fine. Visual inspection catches obvious problems, not degradation. If storage history is in question, appearance is not the deciding factor — your pharmacy's guidance is.
Frequently asked questions
Can I put compounded semaglutide in the freezer?
No. Freezing can permanently degrade the peptide, and thawing does not reverse it. A frozen vial may look completely normal and still be unreliable. Store it in the main body of a refrigerator, generally between 36°F and 46°F (2°C–8°C), or as directed on your label, and discard and replace any vial you believe has frozen.
How long can compounded semaglutide be out of the fridge?
There is no single answer, because it depends on your specific formulation, the temperature, and the duration. Contact your compounding pharmacy with the details and let them advise. Guidance published for brand-name pen products does not apply to compounded vials, which have different formulations and stability profiles.
How long is my vial good for?
Use the beyond-use date printed on your label, plus any post-opening window your pharmacy specifies. These are set for your specific preparation. General figures quoted online are not a substitute for what your pharmacy determined for your vial.
How do I travel with semaglutide on a plane?
Carry it in your hand luggage, never checked baggage. It is a medical liquid and exempt from standard TSA liquid size limits — declare it at the checkpoint along with needles, syringes, and any ice packs or cooling cases. Use an insulated cooler in transit and refrigerate on arrival. For international travel, carry a copy of your prescription and check your destination's requirements in advance.
Does compounded semaglutide look different from brand-name?
Both are generally clear and colorless to slightly yellow, with no visible particles. Some compounded formulations include additives such as B12 or glycine that brand-name products do not contain. Cloudiness, discoloration, or particulate matter in any injectable is a reason to stop and contact your pharmacy.
† This article is for informational purposes only and does not constitute medical advice. Compounded semaglutide is not FDA-approved and is not reviewed by the FDA for safety, effectiveness, or manufacturing quality. Storage requirements, beyond-use dates, and post-opening windows vary by pharmacy, formulation, and additives — always follow the specific instructions provided by your compounding pharmacy and printed on your prescription label, which take precedence over any general guidance here. Storage and stability information for brand-name products does not apply to compounded preparations. TSA guidance is subject to change; verify current rules at TSA.gov before traveling. If you have any question about whether a vial is safe to use, contact your pharmacy or provider rather than using it. Ozempic® and Wegovy® are registered trademarks of Novo Nordisk. Ondra Health is not affiliated with Novo Nordisk.