Lipitor is a medication used to lower cholesterol levels in the body. According to Drug Patent Watch [1], the active ingredient in Lipitor is atorvastatin calcium. Atorvastatin calcium is a type of medication known as a statin, which works by blocking the production of cholesterol in the liver.

When it comes to food-drug interactions, WebMD [2] notes that certain foods can affect the way medication is absorbed, metabolized, or excreted from the body. However, the website does not mention any specific interactions between dairy and Lipitor.

Similarly, an article on the Blanchard Valley Health System website [3] lists several common food-drug interactions but does not mention any interaction between dairy and Lipitor.

Therefore, based on the sources provided, there is no evidence to suggest that dairy will affect the effectiveness of Lipitor. However, it is always important to consult with a healthcare provider or pharmacist before starting any new medication or making significant changes to your diet.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.webmd.com/drug-medication/ss/slideshow-affect-medication
[3] https://www.bvhealthsystem.org/expert-health-articles/common-food-drug-interactions