How Mounjaro Should Be Stored
Mounjaro (tirzepatide) is a prescription-only, once-weekly injectable medicine supplied as a pre-filled pen. Like many injectable medicines, it requires careful storage to remain effective.
In the fridge
Unopened pens should be stored in a refrigerator, typically between 2°C and 8°C. They should not be frozen — if a pen has been frozen, it should not be used, and you should contact your prescriber or pharmacist for guidance.
Out of the fridge
Once removed from the fridge, a Mounjaro pen can generally be kept at room temperature for a period of time before use. The exact number of days varies by product batch and guidance version, so always refer to the patient information leaflet inside your packaging or check the electronic Medicines Compendium (eMC) for the current summary of product characteristics. Never rely on memory alone for a specific figure.
General storage tips
- Keep pens away from direct light and heat sources.
- Store in the original carton to protect from light.
- Do not use a pen that has been left out beyond the period stated in your leaflet.
- Check the expiry date printed on the pen before each injection.
For more detail on how to look after your pens, see our guides on whether Mounjaro needs to stay in the fridge and Mounjaro fridge storage requirements.
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Keeping Track of Your Pens and Doses with GLP Trackr
One practical challenge when managing a weekly injectable is simply remembering which pen you used, when, and how it was stored — especially if you travel or your routine changes. GLP Trackr's dose logging feature lets you record each injection with its date, time, and dose strength, so you always have a clear history to hand.
If you are ever uncertain whether a pen was stored correctly — for example after a trip or a power cut — having a log of when each pen was taken out of the fridge can help you have a more informed conversation with your pharmacist or prescriber. You can also set dose reminders in the app so your weekly schedule stays consistent without having to rely on memory.
Our guide on Mounjaro storage and the fridge covers related questions, and you can find broader information about managing your Mounjaro journey on our Mounjaro hub.
Always follow the storage instructions in your patient information leaflet and, if in doubt about whether a pen is still safe to use, contact your prescriber or pharmacist — they are the right people to advise you. GLP Trackr helps you stay organised and informed; it is not a substitute for professional guidance.
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Frequently asked questions.
Yes. Mounjaro pens should be stored in a refrigerator, typically between 2°C and 8°C, until you are ready to use them. Check the patient information leaflet in your packaging for the full storage instructions specific to your pen.
Once removed from the fridge, a Mounjaro pen can be kept at room temperature for a limited period. The exact duration is stated in your patient information leaflet — always check this rather than relying on a general figure, as guidance can vary.
Leaving a pen out beyond the period stated in your leaflet may affect the medicine. If you are unsure whether a pen has been stored correctly, do not use it without speaking to your prescriber or pharmacist first.
No. Mounjaro pens should not be frozen. If a pen has been accidentally frozen, do not use it. Contact your prescriber or pharmacist for advice on what to do next.
GLP Trackr lets you log each dose with the date and time, making it easier to track when a pen was first taken out of the fridge. This can be a helpful reference when discussing storage concerns with your prescriber or pharmacist.