Lipitor is a brand name for atorvastatin, a medication used to lower cholesterol levels. According to Drug Patent Watch [1], the patent for Lipitor expired in 2011, which means that other companies can now produce generic versions of the drug. Lipitor and its generic versions are widely used to treat high cholesterol, but they can cause side effects, including fatigue and muscle pain.

A study published in the Journal of Clinical Lipidology [2] found that some patients taking statins like Lipitor reported decreased energy levels. The study suggested that this could be due to the way that statins affect the body's production of coenzyme Q10 (CoQ10), which is involved in energy production. The study concluded that supplementing with CoQ10 may help alleviate the fatigue associated with statin use.

Healthline [3] also suggests that statins like Lipitor can cause fatigue, although the exact duration of this side effect is not specified. The article recommends that patients who experience fatigue while taking statins should talk to their doctor, who may adjust the dosage or switch to a different medication.

In summary, Lipitor and other statins can cause fatigue as a side effect, possibly due to their impact on CoQ10 production. The duration of this side effect is not specified in the sources provided, but patients who experience fatigue while taking statins should talk to their doctor about possible solutions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2949584/
[3] https://www.healthline.com/health/high-cholesterol/can-statins-make-you-tired