Sentence: Blood was sampled immediately prior to premedication ( temazepam ) , after induction of anaesthesia ( fentanyl and thiopentone ) and at 10-minute intervals until the end of the procedure ( N2O maintenance , vecuronium relaxation ) .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['temazepam', 'fentanyl', 'thiopentone', 'vecuronium'], 'is_context_needed': True}]