selegiline

noun

se·​leg·​i·​line si-ˈlej-ə-ˌlēn 

: 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