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Green tea has been touted for its ability to lower blood pressure, but new research reveals that the beverage can also make hypertension drugs less effective.

Japanese researchers from Fukushima Medical University discovered that the blood-pressure drug nadolol is less effective after drinking green tea.

The latest study involved ten healthy men and women. The participants were given nadolol once after drinking two cups of green tea a day for two weeks and again after drinking water.

The findings revealed that green tea diluted the blood-pressure drug by cutting the concentration that entered the bloodstream by three-quarters. Researchers believe that the chemicals in green tea may interfere with the intestine's ability to absorb and transfer the drug into the bloodstream.

"Patients with nadolol should avoid taking green tea," researchers wrote in the study, according to Daily Mail.

"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 spokesman for the American Heart Association who was not part of the study, according to HealthDay.

The findings are published in the journal Clinical Pharmacology & Therapeutics.