Lipitor is a brand name for atorvastatin, a medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], Lipitor's active ingredient, atorvastatin, works by inhibiting an enzyme called HMG-CoA reductase, which is responsible for producing cholesterol in the liver.

In a study published by the National Center for Biotechnology Information [2], it was found that statins, including atorvastatin, may have a negative impact on muscle growth and repair after exercise. The study revealed that statins may interfere with the signaling pathways that regulate muscle growth and repair, which could potentially hinder post-workout muscle growth.

However, the British Heart Foundation [3] suggests that the benefits of taking statins, including Lipitor, far outweigh the risks. Statins have been shown to significantly reduce the risk of heart attacks and strokes, particularly in people with high cholesterol levels. The foundation advises people who are taking statins to continue taking them as prescribed by their doctor and to maintain a healthy lifestyle that includes regular exercise.

In conclusion, while Lipitor's active ingredient, atorvastatin, may have a negative impact on muscle growth and repair after exercise, the benefits of taking the medication for cholesterol management and reducing the risk of heart attacks and strokes outweigh the potential risks. It is important to continue taking Lipitor as prescribed by a doctor and to maintain a healthy lifestyle that includes regular exercise.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/
[3] https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/statins-fact-or-fiction