Green Tea may reduce the effectiveness of medication used to lower your blood pressure. A new study published in the journal Clinical Pharmacology & Therapeutics Jan. 13 found that drinking tea may actually lessen the efficacy of the drug nadolol commonly prescribed for treating high blood pressure per Tech Times.
Researchers recruited ten adults and gave them a single dose of 30 milligrams of nadolol after drinking three cups of green tea or water every day for two weeks. When the volunteer’s blood was tested, they found the concentration of nadolol was 76 percent lower compared to those that drank water. They also found that the amount of nadolol detected in the urine was approximately 80 percent lower among those who drank green tea regularly.The results concluded that green tea may reduce the ability for nadolol to be absorbed well by the body. Follow up lab tests showed that green tea blocks a drug transporter found in the lining of the gut that helps transport nadolol from the gut into the cells, where it works on reducing blood pressure.
Researchers acknowledged that further studies will need to be conducted to understand how green tea may react with drugs like nadolol but they have advised patients currently taking nadolol to avoid drinking green tea.
“Individuals who take nadolol and also consume green tea should be aware of this potential interaction and discuss this with their physician,” said Dr. Gregg Fonarow, a professor of cardiology at the University of California in Los Angeles and spokesman for the American Heart Association.
Sotiris Antoniou, spokesman for the Royal Pharmaceutical Society and consultant pharmacist in cardiovascular medicine recommended a way to get around this. He advised high blood pressure patients who still need their green tea fix to leave a four-hour gap in between cups and taking their medication.