A client is taking warfarin (Coumadin) after experiencing a stroke. Which herbs must the nurse caution the client to avoid?
1. Green tea
2. St. John's wort
3. Soy
4. Feverfew
5. Ginger
Correct Answer: 1,2,3
Rationale 1: Green tea can decrease the anticoagulant effects of warfarin, increasing the risk for thromboembolic events.
Rationale 2: St. John's wort can decrease the anticoagulant effects of warfarin, increasing the risk for thrombolytic events.
Rationale 3: Soy can decrease the anticoagulant effects of warfarin, increasing the risk for thrombolytic events.
Rationale 4: Feverfew may interact with warfarin to increase the risk of bleeding, not thromboembolic events.
Rationale 5: Ginger may interact with warfarin to increase the risk of bleeding, not thromboembolic events.
Global Rationale: Green tea, St. John's wort, and soy can decrease the anticoagulant effects of warfarin, increasing the risk for thromboembolic events. Feverfew and ginger may interact with warfarin to increase the risk of bleeding, not thromboembolic events.
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