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]. Statins like Lipitor can cause muscle pain or muscle strains as a side effect, although this is relatively rare [2]. The duration of muscle strains caused by Lipitor can vary depending on the individual and the severity of the strain. In general, muscle strains caused by Lipitor should improve within a few weeks after stopping the medication [3]. However, some people may experience persistent muscle pain even after stopping Lipitor, and in these cases, it is important to seek medical advice [3]. To prevent muscle pain caused by statins like Lipitor, it is recommended to maintain a healthy lifestyle, including regular exercise, a balanced diet, and adequate hydration [2]. Additionally, some supplements like CoQ10 may help alleviate muscle pain caused by statins [3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/classes/statins/muscle-pain-statins-how-to-prevent-common-side-effect
[3] https://www.health.harvard.edu/pain/managing-statin-muscle-pain