Purpose: The effects of extreme temperatures on drug delivery of two albuterol sulfate hydrofluoroalkane, metered-dose inhalers (MDIs) were evaluated.Methods. Three Proventil HFA and three ...

Inhalers generally expire 1 year after they’re issued, but depending on how they’re stored, they may be good for months after that. If there’s any doubt, get a new one. You may wonder ...