Quick Summary
Store Mounjaro in the refrigerator (2°C-8°C/36°F-46°F) in the original carton. Do not freeze. Once opened, can be stored at room temperature (up to 30°C/86°F) for up to 21 days. Protect from light and excessive heat. Proper storage ensures medication effectiveness and safety.
How to Store Mounjaro Injections: Storage Instructions
Medical Review: Reviewed by registered pharmacist. Last Updated: December 2025. Location: Glasgow, Scotland.
Proper Storage Temperature
Correct storage is essential to maintain Mounjaro's effectiveness and safety. Follow these guidelines carefully:
Before First Use (Unopened)
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Temperature: Store in refrigerator between 2°C and 8°C (36°F to 46°F)
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Location: Keep in the original carton to protect from light
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Do not freeze: Never place in the freezer compartment
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Avoid door: Store in the main refrigerator compartment, not the door (temperature fluctuates)
After First Use (Opened)
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Room temperature: Can be stored at room temperature up to 30°C (86°F)
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Time limit: Use within 21 days of first use
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Protect from light: Keep in original carton or protect from direct light
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Refrigeration optional: You can continue storing in refrigerator if preferred
What NOT to Do
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Do not freeze: Freezing damages the medication and makes it ineffective
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Do not expose to heat: Avoid temperatures above 30°C (86°F)
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Do not expose to direct sunlight: Keep in original carton to protect from light
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Do not use after expiry: Check expiration date before each use
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Do not use if frozen: If accidentally frozen, discard and contact your pharmacist
Storage Tips
- Use a refrigerator thermometer: Ensure your refrigerator maintains the correct temperature
- Store in main compartment: Avoid the door where temperature fluctuates
- Keep in original packaging: Protects from light and provides important information
- Label with date opened: Mark the date you first use the pen to track the 21-day limit
- Keep out of reach of children: Store safely, especially if storing at room temperature
- Check before each use: Inspect the medication for any changes in appearance
Traveling with Mounjaro
When traveling, proper storage is especially important:
- Use a cool bag: Insulated bag with ice packs (not frozen packs directly touching the pen)
- Carry in hand luggage: When flying, never check medication (cargo holds can freeze)
- Bring documentation: Carry prescription or letter from your pharmacist
- Plan ahead: Ensure you have enough medication for your trip
- Check destination storage: Ensure you'll have access to proper storage at your destination
What to Do If Storage Guidelines Are Not Followed
If you suspect Mounjaro has been stored incorrectly:
- Do not use the medication if it has been frozen or exposed to excessive heat
- Contact your pharmacist immediately for guidance
- Do not risk using potentially ineffective medication - your pharmacist can provide a replacement if needed
- When in doubt, ask: It's always better to check with your pharmacist than risk using compromised medication
Frequently Asked Questions
How should I store Mounjaro injections?
Store Mounjaro in the refrigerator between 2°C and 8°C (36°F to 46°F). Keep it in the original carton to protect from light. Do not freeze. Once opened, you can store it at room temperature (up to 30°C/86°F) for up to 21 days.
Can I freeze Mounjaro?
No, do not freeze Mounjaro. Freezing can damage the medication and make it ineffective. If Mounjaro has been frozen, do not use it and contact your pharmacist for a replacement.
How long can I keep Mounjaro at room temperature?
Once opened, Mounjaro can be stored at room temperature (up to 30°C/86°F) for up to 21 days. After 21 days, discard any remaining medication even if the pen still contains medication.
What happens if Mounjaro gets too warm?
If Mounjaro is exposed to temperatures above 30°C (86°F), it may become less effective. If you suspect the medication has been exposed to excessive heat, contact your pharmacist before using it.
Can I travel with Mounjaro?
Yes, you can travel with Mounjaro. Keep it in a cool bag or insulated container with ice packs. Do not let it freeze. When flying, carry it in your hand luggage (not checked baggage) to avoid temperature extremes.
Have Questions About Storage?
Our pharmacist can provide detailed storage instructions and answer your questions
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