Sentence: Because the incidence of nausea and vomiting is significantly reduced when ketorolac is used in place of opioids to attenuate postoperative pain , it would appear to be an appropriate choice of agent to use following propofol anesthesia .
Drug combination annotation:
[{'class': 'POS', 'spans': ['ketorolac', 'propofol'], 'is_context_needed': False}]