Lipitor, also known as atorvastatin, is a medication used to treat high cholesterol levels in the blood. According to Drug Patent Watch [1], Lipitor is a popular drug and was first approved by the US FDA in 1996. It is a member of the statin drug class, which is known to have some side effects. One of the most common side effects of Lipitor is fatigue, which is reported by some patients who take the medication [2]. However, fatigue is not a universal side effect, and not all patients who take Lipitor experience it [3].

The Mayo Clinic [2] explains that fatigue is a common side effect of statin drugs, including Lipitor. Statins work by inhibiting the production of cholesterol in the liver, which can lead to a decrease in energy levels. However, the fatigue caused by Lipitor is usually mild and goes away on its own as the body adjusts to the medication. If fatigue persists or becomes severe, patients should consult their doctor to discuss alternative treatments or dosage adjustments.

Medical News Today [3] also notes that muscle pain and weakness are other common side effects of statin drugs, including Lipitor. These side effects can also contribute to feelings of fatigue. In rare cases, statins can cause more serious side effects such as liver damage, memory loss, and an increased risk of diabetes.

In conclusion, fatigue is a common side effect of Lipitor, but not all patients who take the medication experience it. If fatigue persists or becomes severe, patients should consult their doctor to discuss alternative treatments or dosage adjustments. It is also important to note that statin drugs, including Lipitor, can cause other side effects such as muscle pain and weakness, and in rare cases, more serious side effects such as liver damage and memory loss.

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