Medical Definition of selegiline
: the levorotatory form of the monoamine oxidase inhibitor deprenyl that is administered in the form of its hydrochloride C13H17N·HCl as an adjuvant to therapy using the combination of L-dopa and carbidopa in the treatment of Parkinson's disease and is sometimes used alone to treat endogenous depression or to treat dementia associated with Alzheimer's disease
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