Lipitor is a medication used to lower cholesterol levels in the blood, and it belongs to a class of drugs called statins [1]. Grapefruit and grapefruit juice contain compounds that can interfere with the metabolism of certain drugs, including Lipitor, leading to an increased risk of side effects [2]. Therefore, it is recommended to avoid consuming grapefruit or grapefruit juice while taking Lipitor [3]. The exact amount of grapefruit that can be safely consumed with Lipitor is not clear, and it is best to avoid it altogether to prevent any potential interactions [2]. Patients taking Lipitor should consult their healthcare provider for further guidance on dietary restrictions and drug interactions [3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://ro.co/health-guide/lipitor-and-grapefruit/
[3] https://www.goodrx.com/classes/statins/why-cant-i-have-grapefruit-with-my-statin