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Scott Weaver
Updated at: May 23, 2025 · 5 min read
Storing And Managing Mounjaro Temperature: What To Do If Your Pen Was Delivered Warm Or Is Accidentally Exposed To Heat
Mounjaro is an effective treatment used to support weight loss and manage blood sugar levels. But how you store it matters. Here’s everything you need to know if your Mounjaro pen feels warm, is left out of the fridge, or you’re worried about heat damage.
Key Takeaways
1. Mounjaro is safe at room temperature for 30 days
You don’t need to panic if your pen feels warm on delivery, it can safely stay out of the fridge for up to 30 days after it has been dispensed, as long as it’s kept below 30°C.
2. Check the pen if it’s been in heat
If Mounjaro has been in a hot place (like a car), check the liquid. It should be clear and colourless. If it looks cloudy or has bits in it, don’t use it.
3. When in doubt, ask your pharmacist
If you’re unsure whether your Mounjaro pen is still safe, speak to your pharmacist or the provider who sent it. They can check if it’s okay or offer a replacement.
Storage Advice
Does Mounjaro need to be kept in the fridge?
Yes, ideally. Mounjaro should be stored in a fridge between 2°C and 8°C [1]. However, once it's been dispensed to you, it’s designed to be stored out of the fridge for up to 30 days at room temperature (below 30°C).
Do I need to worry if it’s not cold on arrival?
No, not necessarily. Your Mounjaro pen doesn't need to stay refrigerated once it's been dispensed. Each pen contains a month’s supply and is built to last for 30 days at room temperature. This is completely normal and expected.
How can I make my Mounjaro pen last longer?
If you'd like to prolong the life of your pen, you can store it in the fridge until you're ready to use it. When travelling, keep it cool using a medical-grade cool pack or travel case.
What should I do if my Mounjaro pen arrives warm?
1. Check the packaging
If the box feels cool or contains a still-cold ice pack, your medication is likely fine.
If the packaging feels hot or the ice pack is completely warm, check the pen more closely.
2. Look for a temperature label
Some deliveries include a temperature-sensitive sticker. If this has changed colour, the pen may have been exposed to excessive heat.
3. Inspect the pen
The pen should feel cool to the touch.
The liquid inside should be clear and colourless. If it's cloudy or contains particles, don’t use it.
4. Contact your pharmacy
If you’re not sure whether your Mounjaro is still safe, get in touch with your pharmacy or the service that supplied it. They can advise you and may offer a replacement if needed.
How long can Mounjaro be left out of the fridge?
Safe storage at room temperature
Up to 30 days at room temperature (under 30°C): Safe to use. Keep track of the days.
More than 30 days at room temperature: Do not use. You’ll need a new pen.
Exposed to heat above 30°C (e.g. a hot car): May not be safe. Check with a healthcare professional.
Signs your Mounjaro may not be safe
The pen feels very hot.
The liquid is cloudy or has particles inside.
The medication doesn’t seem to work as expected.
If any of these apply, don’t inject. Dispose of the pen safely and use a new one.
What if I’ve accidentally left it out of the fridge?
Less than 2 hours at room temperature: Still safe to use.
1–30 days at room temperature (under 30°C): Still safe, but track the time.
Exposed to temperatures over 30°C: Speak to your pharmacist before using.
More than 30 days out of the fridge: Don’t use it. Get a replacement.
How can I prevent Mounjaro from getting too warm?
Store in a fridge whenever possible (but never freeze).
Use a medical travel case or insulated cool bag if travelling.
Keep away from heat sources like radiators or hot vehicles.
Have a cold pack ready in case of power cuts or delivery delays.
Final thoughts: Preventing Heat Damage to Your Mounjaro KwikPen
Mounjaro pens can be stored at room temperature for up to 30 days after dispensing.
They don’t need to be refrigerated once you receive them, this is expected and safe.
If you want to prolong the pen’s life, keep it in the fridge until use.
Avoid exposing Mounjaro to heat over 30°C, and inspect the pen before use.
When unsure, speak to a pharmacist or prescriber for advice before using the pen.
When should I get help?
If your pen feels warm and you’re not sure if it’s safe.
If the liquid looks different than usual.
If it’s been left in a hot place for several hours.
When in doubt, always speak to your pharmacist, prescriber, or the provider who dispensed the pen. Never use Mounjaro if you’re unsure about its safety.
Essential Tips for Using Mounjaro Safely and Effectively
Want to get the best results from Mounjaro? UK Meds' complete guide to Using A Mounjaro Injection covers everything you need to know, from:
Our usage guide has all the advice you need to kickstart a smoother weight loss journey with Mounjaro.
Sources
Blog author
Scott Weaver
Scott is an experienced and professional content writer who works exclusively for UK Meds.
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