I have read conflicting reports - should the pen be refrigerated or not once you start using it?

Storage

Unused (unopened) Levemir should be stored in the refrigerator between 2° and 8°C (36° to 46°F). Do not store in the freezer or directly adjacent to the refrigerator cooling element. Do not freeze. Do not use Levemir if it has been frozen.

Unused (unopened) Levemir can be kept until the expiration date printed on the label if it is stored in a refrigerator. Keep unused Levemir in the carton so that it stays clean and protected from light.

If refrigeration is not possible, unused (unopened) Levemir can be kept unrefrigerated at room temperature, below 30°C (86°F) as long as it is kept as cool as possible and away from direct heat and light. Unrefrigerated Levemir should be discarded 42 days after it is first kept out of the refrigerator, even if the FlexPen or vial still contains insulin.

Vials:

After initial use, vials should be stored in a refrigerator, never in a freezer. If refrigeration is not possible, the in-use vial can be kept unrefrigerated at room temperature, below 30°C (86°F) as long as it is kept as cool as possible and away from direct heat and light. Refrigerated Levemir vials should be discarded 42 days after initial use. Unrefrigerated Levemir vials should be discarded 42 days after they are first kept out of the refrigerator.

Levemir FlexPen:

After initial use, the Levemir FlexPen must NOT be stored in a refrigerator and must NOT be stored with the needle in place. Keep the opened (in use) Levemir FlexPen away from direct heat and light at room temperature, below 30°C (86°F). Unrefrigerated Levemir FlexPens should be discarded 42 days after they are first kept out of the refrigerator.

The storage conditions are summarized in Table 13:
Table 13: Storage Conditions for Levemir FlexPen and vial

PLEASE SEE THIS TABLE IN THE LINK BELOW. COPYING IT DISTURBS IT"S LAYOUT. THANKS.

https://www.drugs.com/pro/levemir.html