Sentence: A double-blind , parallel , placebo-controlled study was performed to assess the efficacy of a combination drug product containing the antihistamine , triprolidine , and the sympathomimetic , pseudoephedrine , in the treatment of allergic rhinitis .
Drug combination annotation:
[{'class': 'POS', 'spans': ['triprolidine', 'pseudoephedrine'], 'is_context_needed': True}]