Lipitor is a brand name for the drug atorvastatin, which is a medication used to lower cholesterol levels in the blood. Grapefruit juice contains compounds that can interfere with the metabolism of atorvastatin, leading to increased levels of the drug in the blood, which can cause adverse effects [2]. Therefore, it is recommended to avoid consuming grapefruit or grapefruit juice while taking atorvastatin [2][3].

As for substituting grapefruit juice with other citrus fruits, there is no clear evidence that other citrus fruits have the same effect on atorvastatin metabolism as grapefruit juice [2]. However, it is always best to consult with a healthcare provider before making any changes to your diet or medication regimen [2].

In conclusion, while grapefruit juice should be avoided while taking atorvastatin, there is no clear evidence that other citrus fruits have the same effect. It is recommended to consult with a healthcare provider before making any changes to your diet or medication regimen [2].

Sources:
[1] Drug Patent Watch. 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] Ro. Lipitor and Grapefruit. Retrieved from https://ro.co/health-guide/lipitor-and-grapefruit/