A client is maintained on warfarin (Coumadin) therapy secondary to refractory atrial fibrillation. ...

Correct Answer: 3
Rationale 1: There is no adverse drugdrug interaction between warfarin and vitamin C.
Rationale 2: There is no adverse fooddrug interaction between warfarin and olive oil.
Rationale 3: Drinking green tea while taking warfarin may increase the risk of bleeding.
Rationale 4: There is no adverse fooddrug interaction between grapefruit juice and warfarin.
Global Rationale: Drinking green tea while taking warfarin may increase the risk of bleeding. There is no adverse drugdrug interaction between warfarin and vitamin C, olive oil, or grapefruit juice.