Lipitor (atorvastatin) is a prescription medication used to lower cholesterol levels in the blood [1]. According to the sources provided, grapefruit juice should not be consumed while taking Lipitor [2][3]. Grapefruit juice can interfere with the metabolism of certain drugs, including Lipitor, and increase the risk of side effects [2]. This is because grapefruit juice contains compounds that can inhibit the enzymes responsible for breaking down Lipitor in the liver, leading to an increase in the drug's concentration in the bloodstream [3]. As a result, taking Lipitor with grapefruit juice can increase the risk of side effects such as muscle pain, liver damage, and kidney failure [2][3]. Therefore, it is recommended to avoid consuming grapefruit juice while taking Lipitor or any other statin medication [2][3].

Sources:
[1] DrugPatentWatch. Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Verywell Health. Can I Take Lipitor or Zocor With Grapefruit Juice? Retrieved from https://www.verywellhealth.com/can-i-take-lipitor-or-zocor-with-grapefruit-juice-1124045
[3] GoodRx. Why Can't I Have Grapefruit With My Statin? Retrieved from https://www.goodrx.com/classes/statins/why-cant-i-have-grapefruit-with-my-statin