Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], there is no mention of decreased bile production as a common side effect of Lipitor. However, a study published in the National Center for Biotechnology Information [2] states that statins, including Lipitor, can cause mild elevations in liver enzymes and liver dysfunction, which can lead to a decrease in bile production. The Centers for Disease Control and Prevention [3] also mention that some people may experience side effects from statins, including liver problems, but they do not specifically mention decreased bile production.

In conclusion, while decreased bile production is not mentioned as a common side effect of Lipitor, it is possible that it could occur as a result of liver dysfunction caused by the medication. Patients taking Lipitor should be aware of the potential for liver problems and should report any symptoms to their healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/books/NBK542212/
[3] https://www.cdc.gov/cholesterol/treating_cholesterol.htm