Answer
Serevent Accuhaler (salmeterol xinafoate) has a shelf life of 24 months in moderate climates and 18 months in tropical climates when stored at no more than 30°C.
Sources for this answer
- Serevent AccuhalerGlaxoSmithKline UK · emc · SmPC §6.3 Shelf life · Version 29Document updated
Sources checked