You can keep a vial of Humulin N in the fridge for 31 days. After 31 days, even if there’s still some left in the vial, you should throw it away.
How many Humulin N vials are typically prescribed per month?
Most people with diabetes usually need around two to three vials of Humulin N insulin every month. However, some people might need more vials depending on their specific needs.

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