Lipitor (atorvastatin) is a prescription medication used to lower cholesterol levels in the blood. Grapefruit and its juice can interact with certain medications, including Lipitor, which can lead to potentially dangerous side effects. Therefore, it is recommended to avoid consuming grapefruit or grapefruit juice while taking Lipitor [2][3]. Grapefruit contains a compound called furanocoumarin, which can interfere with the body's ability to break down Lipitor, leading to an increase in its concentration in the bloodstream [2]. This can cause an overdose of the medication, leading to serious side effects such as muscle pain, liver damage, and kidney failure [3]. It is important to consult with a healthcare provider before making any changes to your medication or diet, including the consumption of grapefruit or grapefruit juice [2].

Sources:
[2] https://www.verywellhealth.com/can-i-take-lipitor-or-zocor-with-grapefruit-juice-1124045
[3] https://www.goodrx.com/classes/statins/why-cant-i-have-grapefruit-with-my-statin