title: The on-off effect - a side-effect of long-term levodopa treatment.
mesh_terms: D004644:Emotions; D006801:Humans; D007980:Levodopa / Q000009:adverse effects* / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000188:drug therapy* / Q000523:psychology
chemical_list: D007980:Levodopa