Sentence: In this parallel group , randomized , double-blind study , 301 PD patients , the majority with motor fluctuations , received entacapone ( 200 mg ) or placebo with each daily dose of standard or controlled-release ( CR ) levodopa .
Drug combination annotation:
[{'class': 'POS', 'spans': ['entacapone', 'levodopa'], 'is_context_needed': True}]