title: "On-off" phenomenon in Parkinson's disease.
mesh_terms: D000818:Animals; D002230:Carbidopa / Q000627:therapeutic use; D006801:Humans; D007980:Levodopa / Q000627:therapeutic use; D008750:Methyldopa / Q000378:metabolism*; D010300:Parkinson Disease / Q000378:metabolism*
chemical_list: D007980:Levodopa; D008750:Methyldopa; D002230:Carbidopa