The recommended storage conditions of Levemir insulin are:
After initial use, a cartridge (PenFill) or a prefilled syringe (including FlexPen or InnoLet) may be used for up to 42 days if it is kept at room temperature, below 30°C (86°F). In-use cartridges and prefilled syringes in-use must NOT be stored in a refrigerator and must NOT be stored with the needle in place. Keep all cartridges and prefilled syringes away from direct heat and sunlight.
Not in-use (unopened) LEVEMIR PenFill, FlexPen or InnoLet can be used until the expiration date printed on the label if they are stored in a refrigerator. Keep unused cartridges and prefilled syringes in the carton so they will stay clean and protected from light.
Perhaps if the instructions are not followed it could be not effective, however please do double check this with your doc/pharmacist who prescribed the med, hope this helps?
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