Lipitor is a medication used to lower cholesterol levels in the blood. It contains atorvastatin calcium as the active ingredient. Skim milk, on the other hand, is a low-fat milk product.

There is no direct interaction between Lipitor and skim milk. However, it is important to note that certain food products can affect the absorption of Lipitor in the body. According to the FDA label [3], Lipitor can be taken with or without food. However, taking Lipitor with food, especially high-fat meals, can reduce its absorption. Therefore, it is recommended to take Lipitor at least two hours before or after consuming any grapefruit products, as grapefruit can also affect the absorption of the medication.

As for the potential side effects of Lipitor, it is important to consult with a healthcare provider before taking the medication. According to the Drug Patent Watch [1], the most common side effects of Lipitor include muscle and joint pain, nausea, diarrhea, and headache. In rare cases, Lipitor can cause serious side effects such as liver damage and muscle breakdown.

In conclusion, there is no direct interaction between Lipitor and skim milk. However, it is important to take Lipitor as directed and to avoid consuming grapefruit products at the same time. It is also important to be aware of the potential side effects of Lipitor and to consult with a healthcare provider before taking the medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1312230/
[3] https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/020702s056lbl.pdf