Cocaine is a tropane alkaloid obtained from leaves of the South American shrub Erythroxylon coca. It has a role as a local anaesthetic, a central nervous system stimulant, a sodium channel blocker, an adrenergic uptake inhibitor, a dopamine uptake inhibitor, a serotonin uptake inhibitor, a sympathomimetic agent, a vasoconstrictor agent, a xenobiotic, an environmental contaminant, a plant metabolite and a mouse metabolite. It is a methyl ester, a benzoate ester, a tertiary amino compound and a tropane alkaloid. It is a conjugate base of a cocaine(1+).