How Long Can Omnitrope Vials Last After Opening?
Omnitrope (somatropin) vials remain stable for up to 21 days after first puncture when stored at 36°F to 46°F (2°C to 8°C) and protected from light. Discard after this period or if the solution is cloudy, discolored, or contains particles.[1]
What If I Store It at Room Temperature?
Do not store opened Omnitrope vials at room temperature (above 77°F or 25°C), as stability drops significantly. Use within 24 hours if accidentally left out, but refrigeration is required for the full 21-day window.[1]
How Does This Differ for Prefilled Pens or Cartridges?
Prefilled pens and cartridges also last 21 days after first use under refrigeration, but discard if frozen or exposed to excessive heat. Vials require transfer to a sterile syringe for each dose; pens allow multi-dose convenience without daily reconstitution.[1]
Storage Tips to Maximize Usability
Keep unopened vials refrigerated; do not freeze or shake. After opening, label with puncture date. Avoid mixing with other medications. Proper handling prevents potency loss from light or temperature fluctuations.[1]
Why the 21-Day Limit and What Are the Risks of Overuse?
This limit ensures full potency, as somatropin degrades over time post-exposure to air. Using beyond 21 days risks reduced efficacy in growth hormone therapy, potentially affecting treatment outcomes like growth in children or muscle maintenance in adults.[1]
[1] Omnitrope Prescribing Information, Sandoz Inc., https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/021426s029lbl.pdf