Lipitor is a brand name for the drug atorvastatin, which is a type of medication called a statin used to lower cholesterol levels in the blood [1]. According to GoodRx, grapefruit juice can interfere with the way the body processes statins, including Lipitor, and can lead to an increased risk of side effects [2]. The Harvard Health Letter explains that grapefruit juice can increase the concentration of the drug in the bloodstream, which can lead to an increased risk of side effects such as muscle pain and liver damage [3].

Therefore, it is recommended to avoid drinking grapefruit juice while taking Lipitor or any other statin medication. The amount of time to wait after taking Lipitor before drinking grapefruit juice is not specified in the sources provided. It is best to consult with a healthcare provider or pharmacist for specific instructions on when it is safe to consume grapefruit juice after taking Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/classes/statins/why-cant-i-have-grapefruit-with-my-statin
[3] https://www.health.harvard.edu/heart-health/grapefruit-juice-and-statins