riv·a·stig·mine 
(rĭv′ə-stĭgmēn′)
(rĭv′ə-stĭgmēn′)n.
A drug, C14H22N2O2, that inhibits the action of cholinesterase and is used to treat dementia in people with Alzheimer's disease and Parkinson's disease.
[riva-, of unknown origin + (PHYSO)STIGMINE.]