SEARCH Articles Figures Tables Antiparkinson activity Antiparkinson agents Antiparkinson drugs Antiparkinsonism Antiparkinsonism Antiparkinsonism agent Antiparkinsonism drugs Antiparkinsonism drugs amantadine Antiparkinsonism drugs levodopa Antiparkinsonism-anticholinergic drugs Antiparkinsonism-anticholinergic medication Antiparkinsons drugs