Omnitrope cartridges should be stored at 36°F to 46°F (2°C to 8°C). It is best to store them in the carton or storage case they came with. Once a pen contains a cartridge, do not separate them.

How you’ll store Omnitrope in the refrigerator will depend on the form: After the cartridge is used for the first time, it must remain attached to the pen and kept in the refrigerator for up to ...