Can Norditropin Be Kept Out of the Fridge After Opening?
Norditropin (somatropin injection) can be stored at room temperature up to 77°F (25°C) for up to 21 days after first use, without refrigeration. Keep it away from heat, light, and freezing temperatures. Discard if it exceeds this time or shows discoloration/particles.[1][2]
How Long Exactly After Opening?
For Norditropin FlexPro pens:
- Up to 21 days at room temperature (≤77°F/25°C).
- Or up to 4 weeks if refrigerated (36–46°F/2–8°C).
The in-use period starts from the first needle insertion or pen priming. Novo Nordisk specifies whichever storage condition you choose applies from day one of use—don't switch midway to extend time.[1][3]
What About Unopened Norditropin?
Unopened pens or cartridges must stay refrigerated at 36–46°F (2–8°C) until expiration date. Avoid freezing; thaw slowly in fridge if it happens, but don't refreeze.[1][2]
Why the Temperature Rules?
Norditropin is a protein-based growth hormone sensitive to heat and agitation, which can degrade its structure and potency. Room-temp storage post-opening balances convenience for travel or daily use with stability data from stability studies.[3]
Storage Tips for Pens and Cartridges
- FlexPro pens: After opening, room temp OK for 21 days; protect from light with case.
- SimpleXx or FlexPro with cartridges: Same rules, but change cartridge if traveling.
- Travel: Use a cooler bag; don't leave in hot cars. No refrigeration needed post-opening if within limits.[1][4]
What Happens If It Gets Too Warm?
If exposed above 77°F briefly (e.g., a day), it's often fine if cooled promptly—check for cloudiness. But exceeding 21 days at room temp risks reduced efficacy; discard to avoid underdosing in growth hormone therapy.[2][3]
Patient Questions on Expiration and Disposal
Many ask about date tracking: Mark the pen with opening date using the built-in tracker or label. Dispose of used pens in sharps container; don't reuse beyond in-use period even if product remains.[1][4]
[1]: Novo Nordisk Norditropin Prescribing Information
[2]: FDA Norditropin Label
[3]: Novo Nordisk Storage Guidelines
[4]: Norditropin HCP Resources