noun: (pharmacology) 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 ʟ-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.
