Answer
Diphenhydramine hydrochloride 25 mg tablets in the Flamingo Pharma (UK) Ltd product have a shelf life of 3 years.
Sources for this answer
- Diphenhydramine Hydrochloride 25 mg Tablets 20's (P) (PL 43461/0065)Flamingo Pharma (UK) Ltd · emc · SmPC §6.3 Shelf life · Version 3Document updated
Sources checked