How do you store Mounjaro, Wegovy or Ozempic in an Australian summer? The 30°C limits
Every GLP-1 label in Australia caps heat at 30°C, but the number of days out of the fridge differs a lot. Here is each limit, and what heat does to you as well as the pen.
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Keep unused pens in the fridge at 2–8°C, and never freeze them. Out of the fridge, every Australian label caps the temperature at 30°C. The time allowed differs: up to 30 days for a Mounjaro KwikPen in use, 42 days for a Wegovy FlexTouch or Ozempic pen, and 14 days for Trulicity.
Key takeaways
- A Mounjaro KwikPen in use may be kept out of the fridge for up to 30 days, at no more than 30°C.1
- A Wegovy FlexTouch pen may be kept out of the fridge for up to 42 days after first use, below 30°C.2
- An Ozempic pen in use should be kept below 30°C or in the fridge, and lasts 42 days once started.3
- Trulicity may be kept unrefrigerated for up to 14 days at up to 30°C.4
- Wegovy and Ozempic must not be used if they have been frozen, and the Wegovy label says to keep pens away from the fridge’s cooling element.2,3
- These are the storage rules in each medicine’s Australian label. Your pharmacist can confirm them for your exact pen.
- GLP-1 medicines are prescription-only. If you aren’t yet taking one, our guide on whether to consider one is a better starting point.5
On this page
How long can each pen stay out of the fridge?
It depends on the pen: 30 days for a Mounjaro KwikPen, 42 for Wegovy FlexTouch and Ozempic, 14 for Trulicity, all capped at 30°C.1,2,3,4
| Medicine and device | Before first use | Out of the fridge, at most |
|---|---|---|
| Mounjaro KwikPen Tirzepatide, multi-dose pen | Fridge, 2–8°C | 30 days in use, not above 30°C1 |
| Mounjaro single-dose pen or vial Tirzepatide | Fridge, 2–8°C | 21 days, not above 30°C1 |
| Wegovy FlexTouch Semaglutide, multi-dose pen | Fridge, 2–8°C | 42 days after first use, below 30°C2 |
| Wegovy single-dose pen or syringe Semaglutide | Fridge, 2–8°C | 28 days, not above 30°C2 |
| Ozempic Semaglutide, multi-dose pen | Fridge, 2–8°C | Below 30°C or in the fridge; pen lasts 42 days once in use3 |
| Trulicity Dulaglutide, single-dose pen | Fridge, 2–8°C | 14 days, up to 30°C4 |
From each medicine’s Australian Product Information, section 6.4, checked 12 October 2026. Listed by brand, not ranked. Never freeze any of them.
Watch the wording. Mounjaro and Trulicity say “not above 30°C” or “up to 30°C”. Wegovy FlexTouch says “below 30°C”.1,2,4 Either way, a day hotter than 30°C is outside every label’s limit if the pen sits in that heat.
The same brand can have different rules for different devices. A single-dose Mounjaro pen allows 21 days out of the fridge, not 30.1 Check the device you were given.
How do you keep track of the days?
Write the date on the box the day the pen leaves the fridge or is first used, and count from there to the label’s limit.1,2
For multi-dose pens, the clock starts at first use: “in-use” for Mounjaro, “after first use” for Wegovy FlexTouch.1,2 A KwikPen or FlexTouch pen holds 4 weekly doses, about 28 days.1,2 So a pen used weekly normally finishes inside its limit, if it stays cool enough.
Light matters too. The labels say to keep the pen in its carton, or the cap on, to protect it from light.1,2,3 Remove the needle after each injection. The Wegovy label says this helps prevent blocked needles, leaks, infection and wrong doses.2
What about hot days, cars and power cuts?
Treat 30°C as a hard ceiling. Victoria’s health department says prescribed medicines should generally be stored below 25°C, and some work less well when stored hot.1,6
The Victorian Department of Health warns that some medicines “may be less effective or more toxic when stored at high temperatures”.6 Cars are the classic trap. The inside of a parked car “can be 20 to 30 degrees hotter than the temperature outside”.7 On a 25°C day, that can mean 45°C or more.
Keep pens with you and out of the sun. If you use a cool bag, don’t let the pen touch an ice brick: a frozen Wegovy or Ozempic pen can’t be used.2,3 In your fridge, keep pens away from the cooling element at the back.2
Plan for blackouts. NSW Health publishes advice on storing food and medicines during and after a power outage.8 Ask your pharmacist what to do with a pen if the fridge failed for hours on a hot day.
Four checks for Australia: storage, side effects, doses and reviews.
How can you tell if a pen has been damaged?
Look at the medicine. The Wegovy and Ozempic labels say not to use it unless it is clear and colourless (Ozempic: or almost colourless), and never after freezing.2,3
Heat damage isn’t always visible. If a pen was left above 30°C, or past its days out of the fridge, don’t guess. Ask your pharmacist, or call the maker’s medicines line on the pack. Lilly’s Australian line, printed in the Mounjaro label, is 1800 454 559.1
Report a faulty pen or a suspected bad batch to the TGA.9 Used pens and needles go in a sharps container, not the household bin; our post on sharps disposal covers the rules by state.
Does a GLP-1 change how you cope with heat?
It can add to the risk of dehydration. Vomiting or diarrhoea from the medicine can dry you out, and heat illness itself can cause nausea and vomiting.2,6
The Wegovy and Ozempic labels warn that nausea, vomiting and diarrhoea “may cause dehydration”, which in rare cases harms the kidneys.2,3 Victoria’s health department says heat can also worsen existing heart and kidney disease.6
Heat illness can look like side effects. Heatstroke can cause nausea and vomiting, as well as confusion and a very high body temperature.6 On a hot day, don’t assume nausea is just the medicine.
Sip fluids through the day, especially in the first weeks or after a dose increase. Our guide to life on a GLP-1 covers food, fluids and exercise.
Questions people ask
How long can Mounjaro be out of the fridge?
A Mounjaro KwikPen in use can stay out for up to 30 days at no more than 30°C. Single-dose pens and vials allow 21 days.1
How long can Wegovy be out of the fridge?
A Wegovy FlexTouch pen can stay out for up to 42 days after first use, below 30°C. Single-dose pens and syringes allow 28 days.2
Can Ozempic be kept at room temperature?
Once in use, yes: below 30°C or in the fridge, for up to 42 days. Before first use it belongs in the fridge.3
What if my pen froze?
Don’t use it. The Wegovy and Ozempic labels say not to use a pen that has been frozen.2,3
Can I leave my pen in the car?
Not on a hot day. Every label caps out-of-fridge storage at 30°C, and a parked car can be 20 to 30 degrees hotter than outside.1,2,3,4,7
How we researched this
On 12 October 2026 we read the storage section of the Australian labels for Mounjaro, Wegovy, Ozempic and Trulicity, and Victorian and NSW heat guidance.
We use no images of pens: Australian advertising guidance lists pen images among the things that can promote a prescription medicine.12
Before you move on
- Unused pens live in the fridge at 2–8°C.
- Write the start date on the box.
- Treat 30°C as the ceiling, every day.
- Never use a frozen pen.
- Drink enough on hot days.
More from the Australia blog
The monthly Australia update
An independent guide to GLP‑1 medicines. We don’t sell medicines, take drug-company money, earn commissions or link to any provider. Once a month: PBS decisions, TGA approvals and safety alerts. How we write
Sources
- Eli Lilly. Mounjaro Australian Product Information, version A14.0. Date of revision 2 October 2026. Link
- Novo Nordisk. Wegovy Australian Product Information. Date of revision 22 June 2026. Link
- Novo Nordisk. Ozempic Australian Product Information. Date of revision 25 September 2026. Link
- Eli Lilly. Trulicity Australian Product Information. Date of revision 28 May 2026. Link
- TGA. Advertising Ozempic and GLP-1 receptor agonists is prohibited. Last updated 11 March 2025. Link
- Victorian Department of Health. Extreme heat: information for clinicians. Link
- Better Health Channel (Victorian Government). Never leave kids in cars. Link
- NSW Health. Beat the heat (fact sheet). Link
- TGA. Reporting adverse events for consumers. Last updated 2 September 2026. Link
- healthdirect. Pancreatitis. Link
- healthdirect. How healthdirect can help you (triple zero and the 1800 022 222 helpline). Link
- TGA. Complying with the restrictions on advertising prescription medicines to the public. Guidance, 18 June 2026. Link
Last checked 12 Oct 2026 · Next review due 12 Oct 2027 · Report an error
How this post was made. Written by the GLP Guidebook team from the sources above. It’s general information, not medical advice. Talk to your GP, pharmacist or prescriber before starting, stopping or changing any medicine. We don’t sell, prescribe or recommend any brand or provider. How we write