11/12/2012
Our ambulatory allergy clinic uses multidose vials of allergen extracts purchased from a manufacturer that are not assigned to a specific patient. Do these vials require a 28-day expiration once they are opened?

Thank you for your inquiry.

The question you asked has been reviewed several times on our website. You can find the responses to your question by going to the Ask the Expert and entering “expiration date allergy extracts” into the search box.

Thank you again for your inquiry and we hope this response is helpful to you.

Sincerely,
Phil Lieberman, M.D.