Category:H1 antihistamines

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First Generation H1 Antihistamines Second Generation H1 Antihistamines (tend to cause less drowsiness)
 * Chlorpheniramine (Chlortrimeton, Piriton)
 * Clemastine (Tavist)
 * Dexbrompheniramine
 * Doxepin hydrochloride (Sinequan)
 * Doxylamine
 * Hydroxyzine hydrochloride (Atarax) *Promethazine
 * Triprolidine
 * Cimetidine (Tagamet)
 * Desloratidine - (Clarinex, Xyzal)
 * Famotidine (Pepcid)
 * Fexofenadine (Allegra)
 * Ketotifen (Zaditor/Zaditen (in Europe)
 * Zaditor is only available in the US as eye drops;
 * Zaditen is available by prescription, but it must be obtained from a compounding pharmacy or from abroad.

Others:
 * Levocetirizine (Xyza)
 * Nizatidine (Axid)
 * Roxatidine
 * Cyproheptadine - seratonin and histamine antagonist