Alahist DM is part of the Antihistamine / Alpha-1 Agonist / Non-narcotic Antitussive Combinations class and treats Allergic Conjunctivitis, Nasal Congestion, Allergic Rhinitis and other conditions. Antihistamine / alpha-1 agonist / non-narcotic antitussive combinations are used to treat cold symptoms, allergic rhinitis, cough, and nasal congestion. They work by suppressing cough, shrinking blood vessels in the nose for congestion and blocking the action of histamine which causes allergic symptoms. Alahist DM is only available as a brand name drug.

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