How to Store Mounjaro & Wegovy UK: Fridge, Travel & Shelf Life

Both Mounjaro (tirzepatide) and Wegovy (semaglutide 2.4 mg) must be stored in a refrigerator at 2°C to 8°C until first use. This is a mandatory requirement stated in the Summary of Product Characteristics (SmPC) for both medications and applies to all unused, unopened pens.

Practical fridge storage tips: - Store pens in the main body of the fridge, not in the door compartment — door shelves experience greater temperature fluctuation each time the fridge is opened - Keep pens in their original outer carton to protect from light and accidental damage - Do not store near the freezer compartment or ice-making section — temperatures below 0°C can permanently damage the medication - Set your fridge to maintain 4–5°C as a safe midpoint - Check your fridge temperature periodically, especially in summer or if the appliance is old — a fridge thermometer (available from most UK supermarkets for £5–£10) is a worthwhile investment

If your fridge temperature drops below freezing at any point and the pen has been exposed to frost or frozen, do not use the medication — contact your pharmacist or prescriber.

Once a pen has been removed from the fridge and used for the first time, different rules apply depending on the product:

Mounjaro (tirzepatide): - After first use, Mounjaro pens may be stored at room temperature (up to 30°C) for up to 21 days - After 21 days at room temperature, any remaining pen must be discarded even if solution remains

Wegovy (semaglutide 2.4 mg): - After first use, Wegovy pens may be stored at room temperature (up to 30°C) for up to 28 days - Discard after 28 days at room temperature regardless of remaining solution

Important notes for both products: - "Room temperature" in the UK context means up to 30°C — but during heatwaves, UK room temperatures can exceed this in non-air-conditioned homes. Check the temperature of the storage location during summer months - Keep pens away from direct sunlight and heat sources (windowsills, radiators, car dashboards) - Do not refrigerate a pen that has already been stored at room temperature and then returned — once at room temperature, keep it there or discard within the specified window

These instructions apply to Mounjaro's single-use auto-injector pens as supplied for weight management in the UK.

Travelling with injectable weight loss medication requires some planning, but is entirely manageable with the right approach.

Within the UK: - For short trips (day trips, weekends): if the pen is in use, it can travel at room temperature for the duration of the trip, provided total room-temperature storage does not exceed the 21/28-day limit - Use a cool bag or insulated pouch (not an ice pack directly against the pen) for journeys during hot weather — direct ice contact can freeze the medication - Do not leave pens in a parked car, particularly in direct sunlight; even in UK temperatures, a car interior can reach 40–50°C in summer

International travel: - Carry a medical cool wallet or insulin travel case (widely available from Frio, Medicool and similar brands for £15–£40) for journeys to warm countries - Keep medication in hand luggage, never checked baggage — aircraft holds are pressurised but not temperature-controlled and can reach sub-zero temperatures - Carry a letter from your prescriber confirming the medication and your identity — this is essential for airport security, particularly for international flights - Check the entry regulations for your destination country — some nations require import permits for GLP-1 medications or have restrictions on injectable medications - At hotels, request a mini-fridge in your room or ask whether medication can be stored in a staff refrigerator (usually accommodated by hotels for insulin-dependent patients)

FRIO cooling wallets are particularly popular among UK GLP-1 users — they work through evaporative cooling and keep medication within the 2–8°C range for approximately 45 hours per soaking, without ice.

One of the most common questions from GLP-1 users is what to do if a pen has accidentally been left out of the fridge overnight or longer.

For unopened pens left at room temperature (unintentional): - Mounjaro: if left at room temperature (below 30°C) for up to 21 days total, the pen can be used — the room-temperature limit applies from first exposure, not first use - Wegovy: up to 28 days at room temperature total remains usable

If a pen has been left above 30°C: - Heat degrades peptide structures; a pen exposed to temperatures above 30°C for extended periods should be treated as compromised - Do not use a pen that has been left in a hot car, on a sunny windowsill, or near a heat source for more than a short time — the degraded medication may be less effective even if it appears unchanged visually

Signs of damaged medication: - Visible particles or cloudiness in what should be a clear solution - Discolouration (Mounjaro is normally clear and colourless) - The solution should never be used if it appears anything other than clear

If in doubt, discard and replace. The cost of a replacement pen is far less significant than the risk of injecting degraded medication or missing a dose due to uncertainty. Contact your prescriber or pharmacist for a replacement — most UK GLP-1 providers are familiar with accidental out-of-fridge scenarios.

Used injectable pens and any associated sharps must be disposed of correctly under UK regulations. Auto-injector pens are designed so that the needle retracts after use, but disposal protocols still apply.

Collection and disposal in the UK: - Your prescribing pharmacy or GP surgery can advise on your local sharps disposal scheme — many areas operate a free collection service - Some local councils provide sharps bins (also called yellow bins or sharps disposal containers) free of charge — check your council website or ask your pharmacist - Used pens should be placed in an approved sharps container and never in general household waste or recycling - Flushing or putting pens down the sink is not appropriate — even when empty, pens may contain trace medication that should not enter the water supply

What to tell your pharmacist: - The brand name (Mounjaro or Wegovy) - Approximate quantity requiring disposal - Whether you need a new sharps container

The UK NHS operates sharps return schemes through most community pharmacies — this is the simplest route for most patients. Your private prescriber should also be able to point you to an appropriate disposal route if NHS services are unavailable to you.

*This guide is for informational purposes only. Always refer to the official SmPC for your specific product and consult your prescriber or pharmacist if you are uncertain about storage or disposal.*