Green tea may interfere with a blood pressure medicine - KFYRTV.COM - Bismarck, ND - News, Weather, Sports

Green tea may interfere with a blood pressure medicine

Updated:
© iStockphoto.com / George Clerk © iStockphoto.com / George Clerk
  • HealthMore>>

  • Spouse's sunny outlook may be good for your health

    Spouse's sunny outlook may be good for your health

    Marriage vows often include the promise to stick together for better or for worse, and research now suggests that when it comes to your health, having an optimistic spouse is better.
    Marriage vows often include the promise to stick together for better or for worse, and research now suggests that when it comes to your health, having an optimistic spouse is better.
  • Mental illness not a driving force behind crime

    Mental illness not a driving force behind crime

    TUESDAY, April 22, 2014 (HealthDay News) -- Less than 10 percent of crimes committed by mentally ill people are directly linked to the symptoms of their disorders, a new study shows. "When we hear about crimes committed by people with mental illness, they tend to be big headline-making crimes, so they get stuck in people's heads," said study author Jillian Peterson, a psychology professor at Normandale Community College in Bloomington, Minn. "The vast majority of people with mental illness a...
    TUESDAY, April 22, 2014 (HealthDay News) -- Less than 10 percent of crimes committed by mentally ill people are directly linked to the symptoms of their disorders, a new study shows. "When we hear about crimes committed by people with mental illness, they tend to be big headline-making crimes, so they get stuck in people's heads," said study author Jillian Peterson, a psychology professor at Normandale Community College in Bloomington, Minn. "The vast majority of people with mental illness a...
  • A little wine might help kidneys stay healthy

    A little wine might help kidneys stay healthy

    An occasional glass of wine might help keep your kidneys healthy, new research suggests.
    An occasional glass of wine might help keep your kidneys healthy, new research suggests.

By Kathleen Doheny
HealthDay Reporter

MONDAY, Jan. 13, 2014 (HealthDay News) -- Drinking green tea may lessen the effects of the medication nadolol (Corgard), used to treat high blood pressure, a new small study suggests.

Researchers gave 10 volunteers a single dose of 30 milligrams of nadolol after they had consumed either water or about three cups of green tea daily for 14 days.

When researchers tested blood levels of the drug, they were 76 percent lower in the group that drank green tea compared to the water-drinking group.

According to the study's authors, that means that "patients treated with nadolol should avoid taking green tea." They published the findings online Jan. 13 in Clinical Pharmacology & Therapeutics.

The researchers include Shingen Misaka at Fukushima Medical University in Japan and other universities in Germany, Japan and Italy.

"Individuals who take nadolol and also consume green tea should be aware of this potential interaction and discuss this with their physician," advised Dr. Gregg Fonarow, a professor of cardiology at the University of California, Los Angeles, and a spokesman for the American Heart Association. He reviewed the findings but did not take part in the study.

Nadolol isn't the only drug that interacts with food or beverages. For instance, grapefruit and grapefruit juices can interact with medicines, such as cholesterol-lowering medicines and some blood pressure drugs, according to the U.S. Food and Drug Administration.

Researchers for the new study say ingredients in the green tea are thought to interfere with the absorption of the medication in the intestine.

Nadolol is a type of blood pressure lowering drug known as a beta blocker, used to treat both high blood pressure and angina, the chest pain associated with heart disease.

Beta blockers, in general, work by reducing the heart rate and the heart's workload and reducing the output of blood, thus lowering pressure, according to the American Heart Association.

In the United States, nadolol is used less frequently than other beta blockers, Fonarow said.

"It's not a commonly used beta blocker," agreed Dr. Suzanne Steinbaum, a cardiologist and director of women's heart health at Lenox Hill Hospital, in New York City, and a spokeswoman for the American Heart Association's Go Red for Women campaign.

Among the new study's limitations are the small number of patients included, just 10, Steinbaum said. And she believes that amount of tea consumed would be unusual, at least in the United States. "It is rare to see a patient who drinks more than two cups of green tea a day," she said of her own patients.

Fonarow said that the results may apply only to green tea and nadolol. "It is not clear that those receiving other heart medications and drinking green tea need to be concerned, or that these findings apply to black tea," he said.

Also, although the study showed reduced levels of nadolol in patients who drank green tea, it could not establish a cause-and-effect relationship. The researchers note that larger studies are needed to understand how green tea may react with drugs like nadolol.

The study was funded by partially by the Japanese Ministry of Education, Culture, Sports, Science and Technology.

More information

To learn more about different blood pressure medicines, see the American Heart Association.

Copyright © 2014 HealthDay. All rights reserved.

*DISCLAIMER*: The information contained in or provided through this site section is intended for general consumer understanding and education only and is not intended to be and is not a substitute for professional advice. Use of this site section and any information contained on or provided through this site section is at your own risk and any information contained on or provided through this site section is provided on an "as is" basis without any representations or warranties.
Powered by WorldNow
    Powered by WorldNow
    All content © Copyright 2000 - 2014 Worldnow and KFYR. All Rights Reserved. For more information on this site, please read our Privacy Policy and Terms of Service.