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Yes, insulin does expire — here's how long it takes and when you should no longer use it
Once you open a vial of insulin or pen, another expiration date starts. Generally, insulin expires 28 days after it's opened (for a vial or pen), says Fernandez de Fiore, but some pens only last 7 ...
Medscape1y
Patient Satisfaction and Costs Associated With Insulin Administered by Pen Device or Syringe During Hospitalization
Study design. This prospective, randomized, controlled, parallel-group study compared the use of pen devices with conventional vials and syringes for the administration of insulin in hospitalized ...