Sentence: Randomized trial of betahistine mesilate tablets as augmentation for oxcarbazepine and carbamazepine in treating vestibular paroxysmia .
Drug combination annotation:
[{'class': 'POS', 'spans': ['betahistine', 'oxcarbazepine'], 'is_context_needed': True}, {'class': 'POS', 'spans': [0, 2], 'is_context_needed': True}]