Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body [1]. However, some people may experience muscle pain or weakness as a side effect of taking this medication [3]. According to a study published in the Journal of Pharmacy Practice, muscle pain and weakness associated with statin use typically improve within 2-4 weeks of discontinuing the medication [2]. However, it is important to note that the duration of improvement may vary depending on individual factors such as age, overall health, and the length of time the medication was taken. It is recommended that individuals who experience muscle pain or weakness while taking Lipitor or any other statin medication speak with their healthcare provider to discuss alternative treatment options [3]. Additionally, Harvard Health Publishing recommends incorporating regular exercise and stretching into daily routines to improve flexibility and reduce muscle pain [3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/
[3] https://www.health.harvard.edu/pain/managing-statin-muscle-pain