Mounjaro pens should be kept in the fridge at a temperature between 2°C to 8°C. You should store them in their original packaging to protect the pens from direct light exposure.
Mounjaro pens are not suitable for freezing. If you store them towards the back of your fridge, check to make sure they are not frozen before using them.
You can keep Mounjaro at room temperature for up to 21 days, providing the temperature does not go any higher than 30°C. After 21 days, you need to dispose of any pens kept at room temperature.