HEALTH ADVICE · WEIGHT LOSS
How to store Mounjaro: fridge, travel, and everyday tips
Mounjaro is a fridge-line medicine. Below are the storage principles – with the exact in-use time and temperature to be confirmed against the current SmPC and pen labelling before you rely on them.
Storing your pens
Unopened pens: keep refrigerated at 2–8°C, in the original carton to protect from light. Keep them away from the freezer compartment and the fridge’s back wall, where freezing can occur.
The pen in use: Mounjaro KwikPens are commonly kept out of the fridge for a limited period once in use.
The one hard rule: never freeze
Do not use a pen that has been frozen – freezing damages the medicine and it does not recover on thawing. If a pen has frozen or you suspect it has (for example, it sat against the fridge’s back wall, or was checked into an aircraft hold), do not use it; contact us for advice.
Delivery: how it reaches you safely
We dispatch Mounjaro in temperature-controlled packaging designed to hold fridge-safe conditions in transit. Unpack and refrigerate the pens the same day they arrive. If a delivery arrives compromised — warm packs, damaged carton — don’t use the pens; contact us first.
Travelling with Mounjaro
Flying: carry pens in hand luggage, never the hold — holds can freeze medicines. Security teams are used to injectable medicines; if you’d like a prescriber’s letter for the airport, contact us.
Keeping cool: use an insulated medical travel case with cool packs, with a barrier so pens can’t freeze against them, and refrigerate at your destination. Keep pens out of direct sun and away from heat.
Disposal
Used needles go straight into a sharps bin. Return finished or spoiled pens to a pharmacy for safe disposal rather than putting them in household waste.
Frequently asked questions
Mounjaro KwikPens can be kept out of the fridge for a limited period once in use – the exact time and temperature will be confirmed on this page against the SmPC and pen labelling.
No. Freezing permanently damages the medicine. Contact us about a replacement.
No – aircraft holds can drop below freezing. Hand luggage only, in an insulated bag.
Don’t use the pens until you’ve spoken to us – our packaging is designed for the transit window, but we’ll advise if anything seems wrong.
Ready to start?
Mounjaro is available through our prescriber-reviewed consultation.
References & sources
- Mounjaro (tirzepatide) Summary of Product Characteristics (SmPC), Eli Lilly and Company Limited — electronic medicines compendium (emc), last updated 16 Apr 2026. medicines.org.uk/emc/product/15481/smpc
- Mounjaro Patient Information Leaflet (PIL) — emc. medicines.org.uk/emc/product/15481/pil
- NICE Technology Appraisal TA1026: Tirzepatide for managing overweight and obesity, published 23 Dec 2024, last updated 01 Sep 2025. nice.org.uk/guidance/ta1026
- MHRA Yellow Card scheme (report suspected side effects). yellowcard.mhra.gov.uk
Content on this page is intended for UK audiences and is for general information only; it does not replace the advice of your prescriber or the Patient Information Leaflet supplied with your medicine.
