One of the mysteries of the English language finally explained.
A synthetic derivative of diphenhydramine that has antimuscarinic activity and is used as a muscle relaxant, especially in the treatment of Parkinson's disease and drug-induced parkinsonism; o-methyldiphenhydramine, (CH₃C₆H₄)(C₆H₅)CH·O·CH₂CH₂N(CH₃)₂.
1950s; earliest use found in Journal of the American Medical Association. Origin uncertain; perhaps from or- + -phenadrine.
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