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See the DrugPatentWatch profile for Hydroxyzine
Hydroxyzine is a first‑generation antihistamine (H1 receptor antagonist). Chemically, it’s a piperazine derivative (a substituted benzhydryl piperazine). Interesting relation: cetirizine, a marketed antihistamine, is an active metabolite of hydroxyzine and is also a piperazine antihistamine. If you want, I can share the IUPAC name or a structural breakdown.
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