An Ozempic pen lasts 56 days after first use, regardless of whether you store it in the fridge or at room temperature. After those 56 days, the pen should be thrown away even if medication remains inside. How many weeks of doses you actually get from a single pen depends on which dosage strength you’re prescribed.
The 56-Day Rule
Once you uncap an Ozempic pen and take your first dose, a countdown begins. The FDA-approved label is specific: dispose of the pen after 56 days, which works out to exactly 8 weeks. This rule applies to every pen size and every dose. It doesn’t matter how much liquid is still visible in the pen’s window.
A helpful habit is to write the discard date on your calendar the day you open a new pen. Count forward 56 days from that first injection, and mark it. Any medication left in the pen after that date should not be used.
How Many Doses Per Pen
Ozempic comes in different pen configurations designed for different dose levels, and each pen holds enough medication for a set number of weekly injections.
- 0.25 mg or 0.5 mg pen: Contains 2 mg of semaglutide in 1.5 mL of solution. At the starting dose of 0.25 mg per week, this single pen covers about 8 weeks (which lines up neatly with the 56-day limit). At 0.5 mg per week, the same pen lasts about 4 weeks.
- 1 mg pen: Contains 4 mg of semaglutide in 3 mL of solution. At 1 mg per week, this pen delivers roughly 4 weekly doses.
If you’re in the early dose-escalation phase (starting at 0.25 mg for the first 4 weeks, then moving to 0.5 mg), your prescriber may have you use the same pen across both stages. You’ll still need to discard it at 56 days no matter what.
Why 56 Days Is the Limit
Semaglutide is a protein-based drug, and proteins are less stable than many other types of medication. Over time, especially after the pen has been opened and exposed to temperature fluctuations, the protein molecules can clump together into aggregates. When that happens, you get less active medication per dose. In some cases, those protein clumps can also trigger immune reactions.
The 56-day window is based on stability testing that confirms the drug remains effective and safe within that timeframe under normal storage conditions. Beyond it, the manufacturer can no longer guarantee potency.
Storage Before and After Opening
Unopened Ozempic pens should stay refrigerated between 36°F and 46°F until you’re ready to use them. Check the expiration date printed on the packaging, as that’s the outer limit for an unused pen kept at proper refrigerator temperature.
Once you open a pen, you have two options for the next 56 days. You can keep it in the refrigerator at 36°F to 46°F, or store it at room temperature between 59°F and 86°F. Either approach is fine, and many people prefer room temperature because cold injections can sting more. The key limits to avoid: never let the pen freeze (below 36°F) and never expose it to temperatures above 86°F. If either of those happens, the pen should be discarded.
Keep the pen cap on when you’re not using it. Direct sunlight and heat are the biggest threats to stability, so a medicine cabinet or drawer works better than a countertop near a window or stove.
Traveling With an Ozempic Pen
Since opened pens don’t need refrigeration below 86°F, travel is straightforward in most climates. If you’re headed somewhere hot, an insulated travel case (the same type used for insulin) will keep the pen within a safe range. These are inexpensive and widely available at pharmacies.
A few practical tips for travel:
- Flying: Pack Ozempic in your carry-on, not checked luggage. Cargo holds can reach freezing temperatures. Place the pen and any cooling packs in a clear plastic bag for security screening.
- Driving: Keep the pen in the passenger cabin, not the trunk. Cars parked in the sun can exceed 86°F quickly, so don’t leave medication in a vehicle for extended periods.
- Hot climates: If outdoor temperatures are above 86°F, use a cooler or insulated case with a cool pack. Avoid letting the pen sit directly against an ice pack, which could freeze the medication.
How to Tell If a Pen Has Gone Bad
Before each injection, check the solution through the pen’s viewing window. Ozempic should look clear and colorless. If the liquid appears cloudy, has visible particles floating in it, or has changed color, don’t use it. These are signs of protein degradation. A pen that’s been frozen or exposed to extreme heat should also be discarded, even if the solution still looks normal.
Disposing of an Expired or Empty Pen
Ozempic pens contain a needle attachment and are classified as sharps. Don’t toss them in the regular trash. Place used pens in a sharps disposal container, which you can buy at most pharmacies. Fill the container to about three-quarters full, then seal it.
How you get rid of the sealed container depends on where you live. Many pharmacies, hospitals, fire stations, and health departments accept sharps containers as drop-offs. Some communities offer mail-back programs or special waste pickup services. Your local health department’s website will list the options available in your area.