Grapefruit and medication: A cautionary note
Grapefruit can mean danger when combined with some popular drugs used for high blood pressure, high cholesterol and depression
Grapefruit and grapefruit juice are healthful, providing enough vitamin C, potassium, dietary fiber, and other nutrients to earn the American Heart Association's "heart-check" mark. That's the good news. The bad news is that grapefruit juice can interact with dozens of medications, sometimes dangerously.
Doctors are not sure which of the hundreds of chemicals in grapefruit are responsible. The leading candidate is furanocoumarin. It is also found in Seville (sour) oranges and tangelos; although these fruits have not been studied in detail, the guidelines for grapefruit should apply to them as well.