Lipitor is a brand name for the drug atorvastatin, which is a type of medication called a statin that is used to lower cholesterol levels in the blood [1]. According to a study published in the European Journal of Clinical Pharmacology, atorvastatin can affect sodium levels in the body [2]. The study found that atorvastatin caused a decrease in serum sodium levels in some patients. The exact mechanism by which atorvastatin affects sodium levels is not fully understood, but it is thought to be related to the drug's effect on the liver and kidney function [2].

Another study published in the Nephrology Dialysis Transplantation journal also reported that atorvastatin can cause hyponatremia, which is a condition characterized by low levels of sodium in the blood [3]. The study suggested that the risk of developing hyponatremia may be higher in patients with chronic kidney disease who are taking atorvastatin.

In conclusion, atorvastatin, which is sold under the brand name Lipitor, can affect sodium levels in the body. It may cause a decrease in serum sodium levels and increase the risk of developing hyponatremia, particularly in patients with chronic kidney disease. It is important for patients taking atorvastatin to be aware of this potential side effect and to speak with their healthcare provider if they experience any symptoms of hyponatremia, such as nausea, headache, confusion, or seizures [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://link.springer.com/article/10.1007/s00228-020-03006-8
[3] https://academic.oup.com/ndt/article/23/5/1556/1805591