Patent ID: 8642599

Claim:
A method of treating Parkinson's disease in a subject experiencing same, the method comprising administering to said subject an effective amount of a therapeutic composition comprising a diarylmethylpiperazine compound of formula (I) or formula (II) and pharmaceutically acceptable salts of the 4-((alpha-R)-alpha-((2S,5R)-2,5-Dimethyl-4-(3-fluorobenzyl)-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide or 4-((alpha-R)-alpha-((2S,5R)-2,5-Dimethyl-4-(2-fluorobenzyl)-1-piperazinyl)-3-hydroxybenzyl)-N,N-diethylbenzamide compound; wherein the diarylmethylpiperazine compound of formula (I) or formula (II) exhibits delta opioid receptor agonist and mu opioid receptor antagonist activity.