According to the sources provided, Lipitor (atorvastatin) is a medication used to lower cholesterol levels and reduce the risk of heart attack and stroke [1][2]. The Mayo Clinic lists potential side effects of atorvastatin, including muscle pain, weakness, and tenderness, as well as stomach pain, nausea, and diarrhea [2]. However, the sources do not mention excessive bleeding as a potential side effect of atorvastatin.

A study published in Arteriosclerosis, Thrombosis, and Vascular Biology found that atorvastatin may have anticoagulant effects, meaning it could reduce the ability of blood to clot [3]. However, the study did not report any cases of excessive bleeding associated with atorvastatin use. It is worth noting that this study was conducted in vitro, meaning it was done in a laboratory setting and not on humans.

In conclusion, while atorvastatin may have anticoagulant effects, there is no evidence to suggest that it causes excessive bleeding. As with any medication, it is important to discuss potential side effects with a healthcare provider before starting treatment.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003
[3] https://www.ahajournals.org/doi/full/10.1161/01.atv.0000151647.14923.ec