The following list provides the most common and easily avoided sources of adverse drug reactions concerning blood thinning medications. Keep this list handy and review it whenever you bring home a new prescription for a blood thinner - even after your doctor and pharmacist have vetted it with you.
- Warfarin interacts with antibiotics such as clarithromycin or erythromycin. Can increases the effect of warfarin to cause bleeding.
- Warfarin interacts with feverfew, ginseng, dan-shen, ginkgo biloba, garlic, and other herbals (especially those that start with a "g", for an easy way to remember). May increase the effect of warfarin to cause bleeding.
- Warfarin interacts with spinach, liver and leafy greens. Large quantities of vitamin K may decrease the effects of warfarin, causing blood clots.
- Warfarin interacts with miconazole (found in over-the-counter yeast infection treatments). May increase risk of bleeding and bruising.
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