Based on the information provided, Lipitor is a medication used to lower cholesterol levels in the body [1]. It is a statin, a type of drug that works by blocking the production of cholesterol in the body [1]. While Lipitor is generally considered safe and effective, some people may experience side effects.

One potential side effect of Lipitor is a decline in energy levels [2]. According to a study published in the Archives of Internal Medicine, statins like Lipitor have been associated with reduced energy levels and physical functioning in some patients [2]. The study found that patients taking statins reported a decline in energy levels and physical functioning compared to those not taking the medication [2].

It is important to note that not all patients taking Lipitor will experience a decline in energy levels. If you are experiencing a significant decline in energy levels since starting Lipitor, it is recommended that you speak with your healthcare provider [3]. They can help determine whether Lipitor is the cause of your symptoms and recommend alternative treatments if necessary.

In summary, Lipitor is a medication used to lower cholesterol levels in the body, and some people may experience a decline in energy levels as a side effect [1,2]. If you are experiencing a significant decline in energy levels since starting Lipitor, it is recommended that you speak with your healthcare provider [3].

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/LIPITOR>
[2] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1884835/>
[3] <https://www.yalemedicine.org/news/13-things-to-know-paxlovid-covid-19>