Sentence: Recoveries of both amino acids were increased bilaterally by local perfusion with veratridine ( 100 microM , given under halothane anaesthesia ) , pretreatment with reserpine ( 4 mg/kg , i.p . , 24 h beforehand ) , unilateral pretreatment of the medial forebrain bundle with 6-OHDA ( 8 microg/4 microl ) , and by the systemic ( 1 mg/kg , i.p . ) or bilateral intrastriatal ( 7 microg/0.5 microl under halothane anaesthesia ) administration of the dopamine D2 receptor antagonist haloperidol , but not raclopride ( 2 mg/kg , i.p . ) .
Drug combination annotation:
[{'class': 'POS', 'spans': ['reserpine', 'veratridine'], 'is_context_needed': False}, {'class': 'POS', 'spans': [3, 5], 'is_context_needed': False}, {'class': 'NEG', 'spans': [5, 6], 'is_context_needed': False}]