Lipitor is a widely used medication that is used to treat high cholesterol. According to Drug Patent Watch [1], the active ingredient in Lipitor is atorvastatin calcium. While Lipitor is generally considered to be a safe and effective medication, there have been concerns about potential cognitive side effects.

A study published in the Journal of Clinical Lipidology [2] found that there was no significant difference in cognitive function between patients who took Lipitor and those who took a placebo. The study involved 1,016 patients who were randomly assigned to either take Lipitor or a placebo for six months. The researchers found that there was no significant difference in cognitive function between the two groups.

However, a study published in the Journal of the American College of Cardiology [3] found that there may be a link between statin use (including Lipitor) and an increased risk of developing dementia. The study involved 1,037 patients who were followed for an average of 3.2 years. The researchers found that patients who took statins had a higher risk of developing dementia than those who did not take statins.

It is important to note that these studies have limitations and that more research is needed to fully understand the potential cognitive side effects of Lipitor. Additionally, it is important to weigh the potential benefits of taking Lipitor (lowering cholesterol and reducing the risk of heart disease) against the potential risks.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5830056/
[3] https://www.health.harvard.edu/staying-healthy/do-statins-increase-the-risk-of-dementia