What Temperature Should Mounjaro Be Stored At?

Keeping your Mounjaro pen stored correctly matters because exposure to temperatures outside the recommended range can affect the medicine inside. Here is what is generally understood about Mounjaro storage, based on product information from the electronic Medicines Compendium:

• Before first use: store your pen in the refrigerator between 2°C and 8°C. Keep it away from the freezer compartment and do not freeze it — a frozen pen should not be used.
• After removal from the fridge: the pen can typically be stored at room temperature, below 30°C (86°F), for a period of time. Check your patient information leaflet or the electronic Medicines Compendium (eMC) for the specific number of days permitted, as this is the source you should rely on rather than any general figure.
• Keep it in the original packaging: storing the pen in its outer carton helps protect it from light.
• Never use a pen that has been frozen or one that has been left outside the recommended temperature range for longer than the stated period.

If you are ever unsure whether your pen has been stored correctly — for example after travel or a power cut affecting your fridge — contact your prescriber or pharmacist before using it. They can advise on whether the pen is still suitable to use.

For a deeper look at how temperature affects your pens, see our guide on Mounjaro and temperature guidance, and our dedicated page on whether Mounjaro needs to stay in the fridge.

One practical challenge of a weekly injection routine is remembering exactly when you took a pen out of the fridge — which matters if you are trying to stay within the room-temperature window. GLP Trackr's dose logging feature lets you record the date and time of each injection, giving you a clear, timestamped history of your pens that you can refer back to at any time.

Beyond logging when you injected, the app's reminder system means you are less likely to leave a pen sitting out longer than intended because a forgotten dose got delayed. Set a weekly reminder so your injection stays on schedule and your pen storage stays predictable.

If you ever do have a concern about a pen — whether it looks different, has been stored incorrectly, or you are simply unsure — log it as a note in the app and bring it up with your prescriber or pharmacist at your next contact. GLP Trackr is a companion for your journey, not a substitute for professional guidance on your medication's safety.

You can read more about storing Mounjaro at room temperature on our dedicated page, or visit the broader Mounjaro guidance hub for more on managing your treatment.

If you want a simple way to stay on top of your weekly injection schedule and keep a clear record of every dose, give GLP Trackr a try — it is free to start, with a 7-day trial available on the App Store and Google Play.