What Is the Grapefruit Effect?

Doctors are familiar enough with drug interactions, including the grapefruit effect, to warn patients when they prescribe a medication that requires a vigilant diet or lifestyle change, so people whose medicines are affected by grapefruit, chocolate, or any other food probably already know about it. Information about potential drug interactions is also printed on the information sheet that comes with every prescription. Anyone worried that their daily healthy breakfast is going to wreak havoc with their prescriptions can relax, because it’s probably okay to enjoy that half a grapefruit. But I’ll probably use the grapefruit effect to justify ditching that healthy breakfast to eat Fruity Pebbles instead. You can’t be too careful, you know.