Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the body [1]. According to the National Health Service (NHS), grapefruit can interact with some medications, including Lipitor. Grapefruit contains a chemical called furanocoumarin, which can interfere with the way the body metabolizes certain drugs, leading to higher levels of the medication in the bloodstream than intended. This can increase the risk of side effects [2]. The US Food and Drug Administration (FDA) also warns that grapefruit juice can interact with some medications, including Lipitor, and advises patients to speak with their doctor or pharmacist before consuming grapefruit or grapefruit juice while taking Lipitor [3].

It is important for patients to inform their healthcare provider of all medications and supplements they are taking, including grapefruit or grapefruit juice, to avoid potentially harmful interactions. It is not clear from the sources provided whether or not the doctor of the person asking the question warned them about grapefruit interactions with Lipitor. Therefore, it is recommended that they speak with their doctor or pharmacist about any concerns they may have regarding grapefruit and Lipitor interactions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/common-health-questions/medicines/does-grapefruit-affect-my-medicine/
[3] https://www.fda.gov/consumers/consumer-updates/grapefruit-juice-and-some-drugs-dont-mix