Sentence: They were assigned to either receiving a COCP containing 20 mcg ethinyl estradiol/150 mg desogestrel for two continuous cycle or NSAID ; mefenamic acid 500 mg TDS for 5 days , 21 days apart for two cycles .
Drug combination annotation:
[{'class': 'POS', 'spans': ['ethinyl', 'desogestrel'], 'is_context_needed': True}]