Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], atorvastatin works by blocking an enzyme that produces cholesterol in the liver. It is important to note that certain foods can interfere with the effectiveness of medications, including atorvastatin.

The North Kansas City Hospital [2] warns that grapefruit and grapefruit juice can interact with atorvastatin and increase the risk of side effects. However, there is no mention of yogurt being a potential issue.

WebMD [3] also does not list yogurt as a food to avoid while taking amlodipine-atorvastatin, a combination medication that includes atorvastatin. However, it is always best to consult with a healthcare provider before making any changes to your diet or medication regimen.

In conclusion, based on the provided sources, there is no evidence to suggest that yogurt is unsafe to consume with atorvastatin. However, it is important to speak with a healthcare provider before making any changes to your medication or diet.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nkch.org/blog/foods-that-can-fool-with-your-meds
[3] https://www.webmd.com/drugs/2/drug-78636/amlodipine-atorvastatin-oral/details