A Patient Who Takes Warfarin (Coumadin)experiences Excessive Bleeding,even Though Serum

A patient who takes warfarin (Coumadin) experiences excessive bleeding,even though serum drug levels are normal.The primary care NP should question this patient about the use of:

A) feverfew.
B) echinacea.
C) green tea.
D) ginkgo biloba.

Correct Answer:

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