How long semaglutide stays good depends on whether it’s been opened, which brand you’re using, and how you store it. An unopened Ozempic or Wegovy pen lasts until the expiration date printed on the package (typically up to 24 months from manufacture) as long as it stays refrigerated. Once you start using it, the clock changes significantly.
Ozempic: 56 Days After First Use
An Ozempic pen is good for up to 56 days (8 weeks) after your first injection from that pen. During those 56 days, you can keep it either in the refrigerator at 36°F to 46°F or at room temperature between 59°F and 86°F. Since each Ozempic pen contains multiple doses, this 56-day window is designed to cover the full life of the pen before you move on to a new one.
Before that first use, keep unopened pens in the refrigerator. They’ll remain good until the manufacturer’s expiration date stamped on the label. Once you take the cap off and use the pen for the first time, the 56-day countdown starts regardless of how much medication is left inside.
Wegovy: 28 Days Outside the Fridge
Wegovy pens have a shorter window. Each pen is single-dose, so the storage question is really about how long you can keep an unused pen out of the refrigerator before injecting it. The answer is 28 days, as long as the temperature stays between 46°F and 86°F and the pen cap hasn’t been removed. If 28 days pass without use, the pen needs to be discarded even if it looks fine.
Ideally, Wegovy stays refrigerated at 36°F to 46°F until you’re ready to inject. The 28-day room temperature allowance is meant for situations where refrigeration isn’t available, like during travel or a temporary gap in your routine. Keep the pen away from direct sunlight and out of temperatures above 86°F.
Rybelsus Tablets: Easier but Moisture-Sensitive
The oral tablet form of semaglutide, Rybelsus, doesn’t need refrigeration at all. Store it at room temperature, ideally between 68°F and 77°F, with brief temperature swings up to 86°F being acceptable. Tablets remain good until the expiration date on the bottle.
The catch with Rybelsus is moisture. Keep tablets in their original sealed bottle until you’re ready to take one. Don’t transfer them to a pill organizer or another container, because exposure to moisture degrades the medication. Store the bottle in a dry place with the cap tightly closed.
What Ruins Semaglutide Faster
Three things will shorten semaglutide’s usable life or destroy it outright: heat, freezing, and light.
- Heat above 86°F: Temperatures above this threshold break down the active ingredient. Leaving a pen in a hot car, near a window, or in checked luggage (where cargo holds can fluctuate in temperature) puts the medication at risk.
- Freezing: This is the most damaging scenario. Freezing permanently destroys semaglutide’s chemical structure. Even if the pen thaws and the liquid looks normal, the medication is no longer effective. A frozen pen should be discarded, never injected.
- Light exposure: Keep the pen cap on when not in use. Direct sunlight accelerates degradation, so store pens in a case or drawer rather than leaving them out on a counter.
Storage During Travel
If you’re traveling with Ozempic or Wegovy, pack the pens in your carry-on luggage with an insulated cooling case. Checked bags are exposed to extreme temperature swings in the cargo hold, which can freeze or overheat the medication. You’ll need to declare the pens at airport security.
Once you arrive, put any unopened pens back in a refrigerator. If you’re injecting from an already-opened Ozempic pen, it can stay at room temperature for the remainder of its 56-day window, but keep it below 86°F. In hot climates, an insulated case with a cooling pack is the safest bet between injections. When you’re ready to inject a pen that’s been refrigerated, let it sit at room temperature for about 30 minutes first to make the injection more comfortable.
How to Tell if It’s Gone Bad
Semaglutide solution should be clear and colorless. If the liquid in your pen looks cloudy, discolored, or contains particles, don’t use it. Beyond visual inspection, the simplest rule is to track dates: write the date of first use on the pen with a marker so you know exactly when the 56-day (Ozempic) or 28-day (Wegovy) window ends. If you’re past that date, replace the pen even if it looks fine, because degradation isn’t always visible.
For Rybelsus tablets, check the expiration date on the bottle and inspect for any discoloration or unusual texture. If the tablets have been exposed to significant moisture (a humid bathroom, an open container), they may have lost potency before the printed date.