has as active ingredient diphenhydramine . In the UK Actavis UK markets Promethazine hydrochloride under the Sominex brand. Actavis also markets Sominex Herbal as a herbal sleep aid with three active ingredients: Hops , Valerian , and Passion Flower extracts . Read more... Edit at Wikipedia... Other names 2-(Diphenylmethoxy)-N,N-dimethylethanamine (IUPAC Name);