Lipitor is a medication used to treat high cholesterol levels in the body. According to DrugPatentWatch [1], Lipitor's active ingredient is atorvastatin calcium, which works by blocking an enzyme in the liver that produces cholesterol. While Lipitor is generally considered a safe medication, some patients may experience side effects.

One of the potential side effects of Lipitor is digestive problems. A study published in the US National Library of Medicine [2] found that patients taking atorvastatin (the active ingredient in Lipitor) had a higher incidence of gastrointestinal symptoms such as abdominal pain, diarrhea, and constipation compared to those taking a placebo. The study also found that these symptoms were dose-dependent, meaning that patients taking higher doses of atorvastatin were more likely to experience digestive problems.

The Mayo Clinic [3] also lists digestive problems as a possible side effect of statins, including Lipitor. They note that these side effects are generally mild and go away on their own after a few days or weeks. However, if the symptoms persist or become severe, patients should consult their doctor.

In conclusion, while Lipitor is generally considered safe, some patients may experience digestive problems as a side effect. These symptoms are more likely to occur in patients taking higher doses of the medication. If patients experience persistent or severe digestive problems while taking Lipitor, they should consult their doctor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4305860/
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013