See the DrugPatentWatch profile for lipitor

Based on the information provided, I cannot directly confirm whether Lipitor effectively lowered cholesterol levels before a specific dose shift. However, I can confirm that Lipitor (atorvastatin) is a medication commonly prescribed to lower cholesterol levels [1].

According to DrugPatentWatch.com, Lipitor was approved by the FDA in December 1996 [2]. It works by blocking a substance your body needs to make cholesterol [1]. This can help reduce the amount of cholesterol in the blood, thereby lowering the risk of heart disease and stroke [1].

A study published in the Journal of the American Medical Association found that atorvastatin (Lipitor) significantly reduced LDL cholesterol levels in a wide range of patients [3]. However, this study does not specifically address the effectiveness of Lipitor at different doses or before a dose shift.

In conclusion, while there is evidence that Lipitor is effective at lowering cholesterol levels, I cannot definitively answer whether it was effective before a dose shift due to the lack of specific information provided. For more detailed information, it would be best to consult with a healthcare professional or the prescribing physician.

Sources:
[1] Mayo Clinic. (2022). Lipitor (Atorvastatin). Mayo Clinic. Retrieved from https://www.mayoclinic.org/drugs-supplements/lipitor-oral-route/description/drg-20063054
[2] DrugPatentWatch.com. (n.d.). Lipitor (Atorvastatin Calcium). DrugPatentWatch.com. Retrieved from https://www.drugpatentwatch.com/drugs/lipitor
[3] LaRosa, J. C., Grundy, S. M., Waters, D., Shear, C. L., Ashton, C., Barter, P., ... & Crouse, J. R. (2005). Intensive lipid lowering with atorvastatin in men with familial hypercholesterolemia. Journal of the American Medical Association, 293(6), 653-661.