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Grapefruit Juice: Can It Cause Drug Interactions?
This article discusses the process whereby "chemicals in grapefruit juice and grapefruit pulp [and possibly pomelos and Seville oranges] interfere with the enzymes that break down (metabolize) various drugs in the digestive system -- including certain calcium channel blockers and cholesterol-lowering drugs." Includes a chart showing specific drugs known to have potentially serious interactions with grapefruit products. From the Mayo Clinic.
http://www.mayoclinic.com/health/food-and-nutrition/AN00413

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