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Determination of diphenhydramine hydrochloride in elixir.

A UV spectrophotometric method for the determination of diphenhydramine hydrochloride in the presence of its postulated decomposition products and 5-(hydroxymethyl)-2-furaldehyde in elixirs was developed. The method involves simple extractions with cyclohexane and is suitable for routine and stability assays of various pharmaceutical liquid formulations. The technique is a modification of the USP XVIII method.