Does Semaglutide Expire? Storage, Fridge Time & Shelf Life

Short answer: yes, Wegovy is meant to live in your refrigerator until you use it — but the full story is more useful than that, because there is a limited room-temperature window, a firm rule against freezing, and a few travel and "did my pen get too warm?" situations worth knowing before they happen. Everything here is tied to the FDA prescribing information so you can trust the numbers, but the patient "Instructions for Use" inside your specific box is always the final word, and your pharmacist is the person to call if a pen's history is uncertain.

A quick note on why this matters at all: Wegovy is semaglutide, a peptide medicine — a fragile protein-based drug, not a simple chemical tablet. Peptide and protein injectables are sensitive to temperature, which is why they ship cold and why mishandling can quietly degrade them. (The same is famously true of insulin, where lab studies show heat exposure measurably affects the drug.) So storage is not fussiness — it is what protects the dose you are paying for.

For flights, hotel storage and refill preparation, use the traveling with semaglutide checklist. Storage limits depend on your exact device, so check the instructions supplied with it.

Does semaglutide expire?

Yes, in two ways. Every pen and bottle has a printed expiration date (EXP), and once a pen leaves the fridge or is first used, a shorter clock starts. Whichever comes first wins^1,4.

Unopened and refrigerated, every brand pen lasts until its EXP date. The clock that catches people is the shorter one:

A compounded vial does not carry a manufacturer's expiration date. The pharmacy that made it assigns a "beyond-use date" instead, so write it down when the vial arrives. Never use any semaglutide past its date, or a pen that has been frozen.

The core rule: keep unused Wegovy in the fridge

Per the FDA label, store Wegovy refrigerated at 36°F to 46°F (2°C to 8°C) until you are ready to use it¹. A few practical specifics that come straight from the label:

• •Keep it in the original carton to protect the medicine from light¹.
• •Store it away from the freezer compartment and the cooling element at the back of the fridge — those are the spots most likely to drop below freezing.
• •The middle shelf or a door bin is usually a safer, more stable-temperature home than the very back.

That refrigerated range, 36°F to 46°F, is the same cold-chain window used for many biologic injectables, including insulin pens — it is cold enough to slow chemical breakdown without freezing the protein¹.

Never freeze Wegovy — and how to tell if it happened

This is the one hard line. Do not freeze Wegovy, and if it has been frozen, do not use it¹. Freezing can damage the semaglutide protein in a way you cannot reliably see, and a frozen-then-thawed pen may not deliver a proper dose even if it looks normal.

The most common way people freeze it by accident is shoving the carton against the back wall of the fridge or into a too-cold drawer. If you suspect a pen froze — it was at the back near the cooling element, the liquid looked slushy, or your fridge runs cold — set it aside and call your pharmacist rather than injecting it. Before every injection, also do the visual check the label requires: the medicine should be clear and colorless, and you should not use it if it is cloudy, discolored, or has particles in it¹.

The room-temperature window (this is the part people get wrong)

Here is the nuance that trips people up: Wegovy does not have to be refrigerated every single minute. The FDA label allows a limited period at room temperature, up to 86°F (30°C), if needed¹.

Two important caveats:

1. 1.The number of days is limited, and it can differ by presentation. Wegovy comes as a single-dose prefilled pen and, for some people, as a single-dose vial — and the allowed room-temperature window is spelled out in the Instructions for Use for your specific product. Read that number off your own carton or leaflet rather than relying on a figure you saw online, because getting it wrong means injecting a possibly degraded dose¹.
2. 2.Once it has been out, you generally do not put it back into long-term fridge storage to "reset the clock." Treat the room-temperature window as a one-way countdown for that pen.

If a pen has been at room temperature longer than the label allows, or got hotter than 86°F (a hot car, a sunny windowsill, checked luggage), the safe move is to not use it and ask your pharmacist for guidance. Heat is not harmless to peptide injectables: in a controlled heat-stability study, common insulin types showed measurable changes when held at high ambient temperatures, which is exactly why temperature limits on these drugs are not arbitrary².

Traveling with Wegovy

Because of that room-temperature allowance, short trips are very doable — you just plan around the cold chain:

• •Flying: Keep Wegovy in your carry-on, never checked luggage. Cargo holds can freeze, and freezing is the unforgivable mistake. A small insulated bag with a cold pack works well; just keep the pen from touching the ice directly (you do not want to freeze it on the way to avoiding heat).
• •Cars: Never leave it in a parked car. Interior temperatures blow past 86°F fast in the sun, even on mild days.
• •Longer trips: A medical-grade travel cooler that holds the 36–46°F range is ideal for multi-day travel; for a single day, an insulated pouch and a cold pack usually keep you inside the room-temperature allowance with margin.
• •Security: Medications and cold packs are allowed through airport security; you do not need to hide your pens, and the original carton (with the pharmacy label) makes everything smoother.

When you reach your destination, return the pens to a refrigerator if you can — but remember the room-temperature window is finite, so do not count on indefinitely re-refrigerating a pen that has already spent its allowed days out.

"Does it sting less if I let it warm up first?"

Some people find a refrigerator-cold injection stings a bit more, so they let the pen sit out for a short while to reach room temperature before injecting — and the label's room-temperature allowance makes that fine within the permitted window. This is a comfort trick, not a requirement, and it does not change the medicine. What you should not do is microwave it, run it under hot water, or otherwise actively heat it — gentle is the whole point. If injection discomfort is a recurring issue, where you inject matters too; we cover the trade-offs in where's the best place to inject semaglutide?.

One pen, one dose — then it is done

A storage habit worth naming: Wegovy pens and vials are single-use. After you inject, the pen goes straight into a sharps container, not back into the fridge¹. There is no "save the rest for next week" — each device delivers one weekly dose. If you are new to the mechanics of the shot itself, our step-by-step on how to inject Wegovy walks through the pen and the vial, including the same storage checks at injection time.

A quick word on compounded and gray-market semaglutide

Everything above is the FDA-approved Wegovy storage standard, backed by a tested cold chain and a published label. Compounded semaglutide — the kind sold by some telehealth and med-spa sources — does not always come with the same validated storage data, and products bought from unregulated online sellers may have spent days in uncontrolled temperatures before reaching you, with no way to know. Ask any program how it ships before you order; Wisp, for one, sends its compounded semaglutide drops by refrigerated two-day delivery. That is one more reason to get semaglutide from a legitimate, transparent source; our best semaglutide providers guide shows what each program charges and what that price covers. If you ever receive a product without clear storage instructions, that absence is itself a red flag — as is a vial that arrives as a powder with no stated diluent volume, since the volume is what fixes the concentration every later dose is measured against (our reconstitution calculator shows what a given instruction produces). Where a seller does publish storage data, read whose product it covers: RxPros says its shipments are lab-tested to stay stable for up to three days at up to 120°F, a claim about its own compounded preparation, not about Wegovy.

The honest bottom line

Wegovy belongs in the refrigerator at 36–46°F, in its original carton, away from the freezer — and it must never freeze. There is a limited room-temperature window up to 86°F for convenience and travel, but the exact number of days lives in your Instructions for Use, not in a generic article, and a pen that has overheated, frozen, or looks cloudy should not be injected. This is general storage education, not medical advice for your situation; your pharmacist can confirm whether a specific pen is still safe, and your prescriber set your dose.

For the bigger picture on what semaglutide does and the realistic results behind it, see our pillar guide Semaglutide: How It Works, Results & Side Effects. And if the cold-chain talk has you weighing the daily oral pill instead of the weekly shot, we compare them honestly in Oral vs Injectable Semaglutide. Worth remembering for context: in the SELECT trial, semaglutide also lowered the risk of major cardiovascular events in people with overweight or obesity and existing heart disease³ — a serious medicine that deserves careful handling, every single week.