Lipitor is a widely prescribed medication for lowering cholesterol levels in the blood. However, if Lipitor loses effectiveness, there are alternative medications available that can be prescribed by a healthcare provider. According to Drug Patent Watch [1], there are several generic versions of Lipitor available in the market, such as atorvastatin calcium, which is chemically identical to Lipitor and can be prescribed as a replacement if Lipitor loses effectiveness. Other statins, such as rosuvastatin (Crestor), simvastatin (Zocor), and pravastatin (Pravachol), can also be used as alternatives to Lipitor [3].

A study published in the National Library of Medicine [2] suggests that switching to another statin medication may be effective in reducing cholesterol levels in patients who experience muscle pain or weakness while taking Lipitor. The study found that patients who switched to another statin medication had a significant reduction in muscle symptoms and maintained their cholesterol-lowering benefits.

It is important to note that switching medications should only be done under the guidance of a healthcare provider. A healthcare provider can evaluate the individual's medical history, current medications, and overall health to determine the best alternative medication to Lipitor. Additionally, lifestyle changes, such as a healthy diet and regular exercise, can also help lower cholesterol levels and may be recommended in conjunction with medication [3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1312230/
[3] https://utswmed.org/medblog/statins-answers/