Lipitor is a brand name for the drug atorvastatin, which is a medication used to lower cholesterol levels in the blood. The drug works by inhibiting the enzyme that produces cholesterol in the liver. There is no direct interaction between Lipitor and dairy products. However, it is important to note that consuming large amounts of grapefruit juice or alcohol while taking Lipitor can increase the risk of side effects. Additionally, some herbal supplements such as milk thistle may interact with Lipitor and should be used with caution. It is always recommended to consult with a healthcare provider before taking any new medication or supplement.

Sources:
[1] Drug Patent Watch. Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] US Pharmacist. Food-Drug Interactions. Retrieved from https://www.uspharmacist.com/article/fooddrug-interactions
[3] Drugs.com. Lipitor and Milk Thistle Drug Interactions. Retrieved from https://www.drugs.com/drug-interactions/lipitor-with-milk-thistle-276-128-1633-0.html