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“Drugs interacting with grapefruit and inducing serious clinical consequences (confirmed or very probable) include: immunosuppressants, some statins, benzodiazepines, most calcium channel blockers , indinavir and carbamazepine.”
“The issue of food-drug interactions first became widely known in 1989 when grapefruit was first found to increase the blood levels of felodipine, a calcium channel blocker , and later, in 1996, terfenadine, a non-sedative antihistamine.”
Molecular nutrition & food research • 2008 | View Paper
“Prominent medications known to interact with grapefruit include statins, antiarrhythmic agents, immunosuppressive agents, and calcium channel blockers.”