Lipitor is a brand name for the drug atorvastatin, which is a medication used to lower cholesterol levels in the blood. According to the Mayo Clinic [2], atorvastatin may cause side effects, including changes in heart rate. However, it is unclear how common this side effect is. Healthline [3] lists changes in heart rate as a rare side effect of statins, which include atorvastatin. It is important to note that not everyone who takes atorvastatin will experience this side effect, and it is essential to discuss any concerns with a healthcare provider. Drug Patent Watch [1] does not provide information on the side effects of atorvastatin. In summary, changes in heart rate may occur with the use of atorvastatin, but it is unclear how common this side effect is. Patients should discuss any concerns with their healthcare provider.

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.healthline.com/health/high-cholesterol/statins-list-of-common-types