Lipitor is a brand name for the drug atorvastatin, which is a statin used to lower cholesterol levels in the blood. According to the Mayo Clinic [2], statins such as Lipitor can cause side effects such as muscle pain, weakness, and fatigue. While muscle pain is the most common side effect, fatigue can also occur. This is because statins can affect the production of coenzyme Q10, which is involved in energy production in cells. When coenzyme Q10 levels are lowered, it can lead to fatigue and weakness.

Medical News Today [3] also mentions that statins can cause fatigue as a side effect. It is important to note that not everyone who takes statins will experience fatigue, and the severity of the fatigue can vary from person to person. If you are experiencing fatigue while taking Lipitor, it is important to speak with your doctor to determine if it is related to the medication or if there may be another underlying cause.

In conclusion, Lipitor can cause fatigue as a side effect, although it is not as common as muscle pain. If you are experiencing fatigue while taking Lipitor, it is important to speak with your doctor to determine the cause and discuss any potential treatment options.

Sources:
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] https://www.medicalnewstoday.com/articles/246611