Herbal supplements and prescription medications

About one-half of adults in the United States report having used at least one dietary supplement in the previous month. But research suggests that only about 34 percent of people taking an herbal supplement tell their doctors about this use — and most of those people also are taking a prescription medication.

Yet many herbal supplements may interact with medications for cardiovascular disease. For example, several popular herbal supplements interact with the blood thinner warfarin (Coumadin, Jantoven).

Here are just a few of the herbal supplements that can affect warfarin:

• Danshen
• Licorice
• St. John's wort

There are several others. 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.