Doxylamine succinate is a highly sedating antihistamine used by itself as a sleep aid, in combination with other drugs as a night-time cold and allergy relief drug, and in combination with Vitamin B6 (pyrodoxine} to prevent morning sickness in pregnant women. It is available by itself as Unisom in the United States, and is also one of the active ingredients in NyQuil.

GoldBamboo

... DOXYLAMINE (Unisom® Sleeptabs™) is an antihistamine commonly used as a nighttime sleep aid. This drug is also used to relieve symptoms of hay fever (allergic rhinitis), hives (rash or itching), and other allergic reactions. Generic doxylamine tablets are available. ...
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