Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. Grapefruit juice has been found to interact with certain medications, including some statins like Lipitor, leading to an increase in their concentration in the bloodstream, which can increase the risk of side effects. Therefore, it is not recommended to consume grapefruit juice while taking Lipitor. According to the sources provided, the interaction between grapefruit juice and Lipitor can cause an increase in the level of Lipitor in the bloodstream, which can lead to an increased risk of side effects such as muscle pain, liver damage, and kidney failure. The sources also suggest that the interaction between grapefruit juice and Lipitor can last for up to 72 hours after consuming the juice. Therefore, it is recommended to avoid consuming grapefruit juice while taking Lipitor. If you have any concerns or questions about taking Lipitor with grapefruit juice, it is recommended to speak with your healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.health.harvard.edu/heart-health/grapefruit-juice-and-statins
[3] https://www.verywellhealth.com/can-i-take-lipitor-or-zocor-with-grapefruit-juice-1124045