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Sominex is the antihistamine Diphenhydramine in the United States, and is sold over the counter (OTC). Promethazine hydrochloride is the antihistamine ingredient in the UK version of Sominex, and is also sold OTC.
Additional recommended knowledge
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sominex". A list of authors is available in Wikipedia.|