Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood. Grapefruit juice can interact with Lipitor, causing an increase in the concentration of the medication in the bloodstream, leading to an increased risk of side effects. Therefore, it is recommended to avoid consuming grapefruit juice while taking Lipitor [2][3].

According to the sources, there is no specific limit on the amount of grapefruit juice that can be consumed with Lipitor. Even small amounts of grapefruit juice can cause the interaction, and it can last for up to 72 hours after consumption [2]. Therefore, it is best to avoid grapefruit juice altogether while taking Lipitor to avoid any potential risks [2][3].

It is important to note that the interaction between grapefruit juice and Lipitor is not unique to this medication. Grapefruit juice can interact with many other medications, including other statins like Zocor (simvastatin) [2]. Therefore, it is important to check with a healthcare provider before consuming grapefruit juice while taking any medication.

In conclusion, it is recommended to avoid consuming grapefruit juice while taking Lipitor to avoid potential risks. There is no specific limit on the amount of grapefruit juice that can cause an interaction with Lipitor, and the interaction can last for up to 72 hours after consumption. It is important to check with a healthcare provider before consuming grapefruit juice while taking any medication.

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