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Herbal supplements may not mix with heart medicines
Some herbal supplements can have dangerous interactions with heart medications.
By Mayo Clinic staffHerbal supplements are natural, so they must be safe, right? Not necessarily. Herbal supplements can have strong effects in the body, and some can interact with prescription medications used to treat heart and circulatory problems, such as high blood pressure and heart failure. Some of these interactions can even be dangerous.
Herbal supplements and prescription medications
At least a quarter of adults who take prescription medications also take dietary supplements, including herbal supplements. That number is even higher among adults older than age 70 — three-quarters report using both prescription medications and dietary supplements.
Yet many herbal supplements interact with medications for cardiovascular disease — which are widely prescribed for older adults. The chances of herbs and drugs interacting are high. Indeed, 8 of the 10 most widely used supplements interact with the blood-thinning medication warfarin (Coumadin). Here are just a few of the herbal supplements that can affect warfarin:
- Danshen
- Dong quai
- Evening primrose oil
- Garlic
- Ginkgo
- Ginseng
- St. John's wort
That's why it's so important to talk with your doctor before taking herbal supplements if you take prescription medications. Your doctor and pharmacist can help you avoid risky interactions.
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- Tachjian A, et al. Use of herbal products and potential interactions in patients with cardiovascular diseases. Journal of the American College of Cardiology. 2010;55:515.
- Gardiner P, et al. Factors associated with dietary supplement use among prescription medication users. Archives of Internal Medicine. 2006;166:1968.
- Nahin RL, et al. Concomitant use of prescription drugs and dietary supplements in ambulatory elderly people. Journal of the American Geriatric Society. 2009;57:1197.
- Natural Product/Drug Interaction Checker. Natural Medicine Comprehensive Database. http://naturaldatabase.therapeuticresearch.com/nd/Search.aspx?cs=MAYO&s=ND&pt=9&Product=warfarin. Accessed Sept. 16, 2011.
- Gardiner P, et al. Herbal and dietary supplement-drug interactions in patients with chronic illnesses. American Family Physician. 2008;77:73.
- Vogel JHK, et al. Integrating complementary medicine into cardiovascular medicine: A report of the American College of Cardiology Foundation Task Force on Clinical Expert Consensus Documents. Journal of the American College of Cardiology. 2005;46:184.
- Herbal and nonherbal supplements a danger for warfarin patients. American Heart Association. http://www.theheart.org/article/1079777.do.Accessed Sept. 29, 2011.
- Garlic. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Sept.16, 2011.
- Ginkgo. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Sept.16, 2011.
- Ginseng. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Sept.16, 2011.
- Hawthorn. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Sept.16, 2011.
- Licorice. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Sept.16, 2011.
- St. John's wort. Natural Medicines Comprehensive Database. http://www.naturaldatabase.com. Accessed Sept.16, 2011.
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