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Ethanolamines are a class of antihistamine drugs of first-generation derived from ethanolamine. Diphenhydramine was the prototypical agent in this group. Of the first-generation antihistamines, the ethanolamine class is considered more sedation than antihistamines of other classes. Recreationally, very high doses can be used to induce delirium and achieve a hallucinogenic effect in which the user sees and hears fully-formed, extremely convincing hallucinations. However, this experience is typically considered highly unpleasant by most users.