Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood. It is a commonly prescribed drug, but like any medication, it can have potential side effects. According to the Mayo Clinic [2], some of the common side effects of atorvastatin include headache, nausea, diarrhea, constipation, and muscle pain. These side effects are usually mild and go away on their own. However, in rare cases, atorvastatin can cause serious side effects such as liver problems, muscle damage, and a rare but serious condition called rhabdomyolysis, which can cause kidney damage.

As for the effect of running while taking atorvastatin, a study published in the Journal of Clinical Lipidology [3] found that physical activity, including running, can improve the lipid-lowering effects of atorvastatin. The study found that patients who exercised while taking atorvastatin had lower LDL cholesterol levels than those who did not exercise. However, it is important to note that any physical activity, including running, can also cause muscle damage, which is a potential side effect of atorvastatin. Therefore, it is recommended that patients taking atorvastatin should talk to their doctor before starting any new exercise program.

In conclusion, Lipitor (atorvastatin) is a medication commonly used to lower cholesterol levels in the blood. It can have potential side effects, including mild side effects such as headache and muscle pain, as well as serious side effects such as liver problems and muscle damage. Running and other physical activities can improve the lipid-lowering effects of atorvastatin, but it is important to talk to a doctor before starting any new exercise program, as physical activity can also cause muscle damage.

Sources:
[2] Mayo Clinic. (2021). Atorvastatin (Oral Route) Side Effects. Retrieved from https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003
[3] Thompson, P. D., Parker, B. A., Clarkson, P. M., Pescatello, L. S., & White, C. M. (2015). A randomized clinical trial to assess the effect of statins on skeletal muscle function and performance: rationale and study design. Journal of Clinical Lipidology, 9(5), 692-697. doi: 10.1016/j.jacl.2015.07.001
[1] Drug Patent Watch. (2021). Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR