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Diphenhydramine Hydrochloride Patent Expiration

Diphenhydramine Hydrochloride was first introduced by Mcneil Consumer Healthcare in its drug Benadryl on Approved Prior to Jan 1, 1982. Other drugs containing Diphenhydramine Hydrochloride are Benylin, Benadryl Preservative Free. 58 different companies have introduced drugs containing Diphenhydramine Hydrochloride.


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Diphenhydramine Hydrochloride Generic API Manufacturers

Several generic applications have been filed for Diphenhydramine Hydrochloride. The first generic version for Diphenhydramine Hydrochloride was by Mk Laboratories Inc and was approved on Approved Prior to Jan 1, 1982. And the latest generic version is by Micro Labs Ltd and was approved on Aug 22, 2025.

Given below is the list of companies who have filed for Diphenhydramine Hydrochloride generic, along with the locations of their manufacturing plants worldwide.