What is it in grapefruit that makes it interact with statins?

Grapefruit contains compounds called furanocoumarins, which inhibit the enzyme CYP3A4 in the liver and intestines. This enzyme is responsible for metabolizing many statins, and when its activity is reduced, it can lead to increased blood levels of the medication. This interaction can raise the risk of side effects, including muscle pain and damage. Therefore, it's advised to limit grapefruit consumption while taking certain statins.