The home health nurse warns the patient who is taking warfarin (Coumadin) for anticoagulant therapy for thrombophlebitis to stop taking the herbal remedy of ginkgo because ginkgo can:
a. cause severe episodes of diarrhea.
b. cause a severe skin eruption if taken with Coumadin.
c. increase the action of the Coumadin.
d. cause the Coumadin to be less effective.
ANS: C
Herbal remedies such as ginkgo, garlic, angelica, and red clover can increase (potentiate) the action of the Coumadin.
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