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Dialysis Discussion => Dialysis: News Articles => Topic started by: okarol on August 24, 2008, 06:23:01 PM
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More Juices Found to Affect Drugs' Effectiveness: Study
By Kathleen Doheny
HealthDay ReporterTue Aug 19, 11:47 PM ET
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.
In each case, substances in the juices affected the absorption of the drugs. Some chemicals block a drug uptake transporter, reducing drug absorption; other chemicals block a drug metabolizing enzyme that normally breaks down the drugs, he said.
"We don't [yet] know all the drugs affected," Bailey said.
Michael Gaunt is a medication safety analyst at the Institute for Safe Medication Practices in Horsham, Pa. He said, "If this study holds true [in future research], you are going to have to warn people in a similar fashion" about other juices.
Gaunt's advice for now: "In general, it's safest to take medication with water."
Bailey agreed. If you opt for water, he said, "a glass is better than a sip. It helps dissolve the tablet." And cool water is better than hot, he added, because your stomach empties cool water faster, sending the medication on its way to the small intestine and finally the blood stream.
More information
To learn more about juice and medication interactions, visit the American Academy of Family Physicians.
http://news.yahoo.com/s/hsn/20080820/hl_hsn/morejuicesfoundtoaffectdrugseffectivenessstudy;_ylt=AubMYYtMaAgl6DotdaHdQnWCSbYF
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I read a similar story on a transplant forum website. I found this to be true because when I switched to drinking only Hawaiian Punch (easier to drink than diet pepsi decaf), my Prograf levels skyrocketed. Didn't think at the time it was due to switching what I drank. I ad to have labs drawn again and the levels where still high. At the end of lastmonth, I switched back to drinking my usual diet pepsi bottles and labs returned to normal. The only thing I looked for when I bought it was to see if it had grapefruit juice and it didn't. Thus I found it puzzling for my labs to go up, but even more puzzling that my tx center was not concerned that the Prograf was so high compared to the usual reading. Also told them that I switched drinks and they didn't see any correlations.
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All my life I've taken medication for either high blood pressure, immune suppression or both, and have never been told that about grapefruit juice. I think I found out because the pharmacies started putting those stickers on the pill bottles about 12-15 years ago or so. At the time I didn't really think about it because I don't like grapefruit juice...apple and orange though? We may have issues! :boxing;
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I guess I'll stick to my agave juice.
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Raw (http://www.cuervo.com/default.aspx) or Refined (http://www.mezcal.com/)?
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I guess I'll stick to my agave juice.
Forgot,
But isn't that what tequila is made from :rofl;
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I wonder if Jack D is considered a juice?
8)
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Jose Cuervo, you are a friend of mine
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I wonder if Jack D is considered a juice?
8)
Better cut down on those whiskey cherry sour smashes then :rofl; :rofl; :rofl; :beer1;