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Blood pressure and cancer medication and the ever popular statins are among the drugs affected.
It is all due to chemicals in the grapefruit, furanocoumarins, which destroy a digestive enzyme breaking down the drugs. This allows more of the drug to escape the digestion process thus entering the body in larger than intended quantities.
For example, Felodipine, a popular blood pressure drug has been measured at triple the intended level when taken with grapefruit juice. Therefore you can take the recommended drug dose and unintentionally cause dangerous toxic levels.
Depending on the drug the grapefruit effect can cause problems such as stomach bleeds, altered heart beat, kidney damage and even sudden death.
And it is not just grapefruits but also other citrus fruits such as Seville oranges, often found in marmalade, and limes that are known to have this undesirable effect.
Another problem can be caused by taking certain antibiotics with milk as this can stop the absorption of the drug rendering it useless.