What is HCI in unisom sleep melts?

Diphenhydramine HCl

Diphenhydramine hydrochloride, an antihistamine that crosses the blood–brain barrier, produces the anticholinergic and sedative effects of Unisom SleepMelts. The chemical formula for diphenhydramine hydrochloride is C₁₇H₂₁NO•HCl, and its molecular weight is 291.816 g/mol.

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