From Humatrope's website:
"How should your patients store Humatrope?
Keep vials and cartridges of Humatrope and diluent for Humatrope in a refrigerator; do not freeze them. Before mixing, check the expiration dates. Do not use expired Humatrope or diluent. After reconstituting Humatrope, keep it in a refrigerator --- again, do not freeze it. Once mixed, Humatrope must be used within 14 days (vials) or 28 days (cartridges). Do not use any Humatrope solution if it is more than 14 days old (vials) or 28 days old (cartridges). Do not shake the Humatrope. If the Humatrope is cloudy or contains any particles or sediment, do not use it. Patients should report the situation to their Humatrope provider, who will advise them about what to do with the product. Colorless specks are okay; these are tiny molecules of protein"