More Juices Found to Affect Drugs' Effectiveness: Study
Aug. 20 -- TUESDAY, Aug. 19 (HealthDay News) -- Grapefruit juice, long known to boost the absorption of certain medications, isn't the only juice that doesn't mix well with drugs, according to the Canadian researcher who first identified the ill effects of grapefruit juice.
Other common juices, including orange and apple, may limit the body's absorption of drugs, compromising their effectiveness, said David Bailey, a professor of medicine and pharmacology at the University of Western Ontario, in London, Ontario, Canada.
Bailey was expected to present his research Tuesday at the American Chemical Society's national meeting, in Philadelphia.
"The original finding is that [grapefruit juice] markedly boosts the amount of drug that gets into the bloodstream," Bailey said. He first reported that nearly 20 years ago when he discovered that grapefruit juice increased the body's blood levels of the drop felodipine (Plendil), used to treat high blood pressure.
Since the original finding, other researchers have identified dozens of other medications that could interact adversely with grapefruit juice, Bailey said.
Doctors traditionally warn against drinking grapefruit juice if you're taking certain medications for high cholesterol, high blood pressure and heart rhythm problems, according to the American Academy of Family Physicians.
In his latest research, Bailey found that grapefruit juice, as well as orange and apple juice, can lower the body's absorption of some medications. Those drugs include the anti-cancer drugs etoposide (Etopophos, Vepesid); certain beta blockers like tenormin (Atenolol) and talinolol (Cordanum), used to treat high blood pressure and prevent heart attacks; cyclosporine, which is used to prevent organ transplant rejection; and some antibiotics, including ciprofloxacin (Cipro), levofloxacin (Levaquin), and itraconazole (Sporanox).
Bailey also found that healthy volunteers who took the allergy drug fexofenadine (Allegra) with grapefruit juice absorbed only half the amount of the drug, compared with volunteers who took the medicine with water.
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