Herbal Supplements, Warfarin Can Be Hazardous Mix

Garlic, ginkgo, St John’s Wort could all upset bleeding/clotting balance, study found

(HealthDay News) — People taking the prescription blood thinner warfarin (Coumadin) may up their risk for health complications if they also take herbal or non-herbal supplements, new research reveals.

In fact, eight out of the 10 most popular supplements in the United States could spark safety concerns with respect to warfarin, while also impacting the drug’s effectiveness.

“I specifically looked at warfarin use, but the real issue is that even though herbal supplements fall under the category of food, and they’re not regulated like prescription drugs, they still have the effects of a drug in the body,” cautioned study author Jennifer L. Strohecker, a clinical pharmacist at Intermountain Medical Center in Salt Lake City.

“Warfarin is a very high-risk medication, which can be associated with severe consequences when it’s not managed properly,” she added. “However, warfarin is derived from a plant, sweet clover. In fact, many of our prescription drugs came from plants. So, it’s very important for patients to recognize that just because an herb is marketed not like a prescription drug [that] doesn’t mean it doesn’t have similar effects in the body.”

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