Lipitor, also known as atorvastatin, is a medication that is commonly used to lower LDL cholesterol levels in the body. According to Drug Patent Watch [1], the patent for Lipitor expired in 2011, which means that generic versions of the medication are now available.

When it comes to the timeframe for Lipitor to lower LDL cholesterol levels, the answer is not straightforward and can vary from person to person. According to WebMD [2], it can take several weeks for Lipitor to start working, and it may take up to four weeks to see a significant reduction in LDL cholesterol levels. However, the timeframe can depend on various factors, such as the starting LDL cholesterol level, the dosage of Lipitor prescribed, and the individual's response to the medication.

A study published in the Journal of Clinical Lipidology [3] found that atorvastatin (Lipitor) can lower LDL cholesterol levels by an average of 39.1% after eight weeks of treatment. However, the study also found that some individuals may see a reduction in LDL cholesterol levels as early as two weeks after starting treatment, while others may take up to 12 weeks to see a significant reduction.

In conclusion, the timeframe for Lipitor to lower LDL cholesterol levels can vary depending on individual factors. While it may take several weeks to see a significant reduction in LDL cholesterol levels, some individuals may see results earlier or later than others. It is important to follow the prescribed dosage and continue taking the medication as directed by a healthcare professional.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.webmd.com/cholesterol-management/features/when-your-doctor-orders-cholesterol-lowering-medications
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6464917/