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Green Tea Interacts with Blood Pressure Pill Nadolol

Green tea can adversely effect the amount of nadolol in the body, and reduce effectiveness of this blood pressure medicine.

Those who prefer green tea as their morning beverage have just been warned that the drug can interact with a beta blocker blood pressure medicine called nadolol (Corgard). Ten people were given either three cups of green tea or water daily for two weeks. Then they were given a single dose of nadolol.

Those who had been drinking green tea had about 76 percent less medication in their bloodstreams later. Urinary levels were 80 percent lower. The researchers suggest that people who must take nadolol should probably stay away from green tea. Those in the green tea group got markedly less blood pressure lowering effect from the nadolol.

It has been known for years that green tea could dramatically lower levels of the chemotherapy drug bortezomib (Velcade). Perhaps it would be helpful for scientists to investigate possible interactions of green tea with other medications.

[Clinical Pharmacology & Therapeutics, online Jan. 13, 2014]

There are many other foods and beverages that can affect medications. Here is a link to our free Guide to Drug & Food Interactions.

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About the Author
Terry Graedon, PhD, is a medical anthropologist and co-host of The People’s Pharmacy radio show, co-author of The People’s Pharmacy syndicated newspaper columns and numerous books, and co-founder of The People’s Pharmacy website. Terry taught in the Duke University School of Nursing and was an adjunct assistant professor in the Department of Anthropology. She is a Fellow of the Society of Applied Anthropology. Terry is one of the country's leading authorities on the science behind folk remedies..
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