A recent NT Times article: Can Grapefruit Juice Affect My Thyroid Medicine?

Link: list of medications affected by grapefruit/grapefruit juice

An excerpt:

“You don’t have to drink liters and liters of the stuff to have an effect,” Dr. Bailey said. For example, he said, “if you take simvastatin and drink a single glass of grapefruit juice, it’s like taking three times the dose,” though the impact can be much more or much less, since individual susceptibilities vary widely….Other citrus fruits like Seville oranges, limes and pomelos can also produce a similar effect.