The average cholesterol drop with Lipitor (atorvastatin) treatment varies depending on the individual's initial cholesterol levels, the dosage prescribed, and other factors. However, clinical trials have provided some insight into the drug's efficacy.

In a meta-analysis of 44 clinical trials, Lipitor was found to reduce low-density lipoprotein (LDL), or "bad" cholesterol, by an average of 39.6% in patients receiving the highest approved dosage (80 mg) [1]. Another study, the Scandinavian Simvastatin Survival Study (4S), found that patients treated with Lipitor experienced an average LDL cholesterol reduction of 35% [2].

It is important to note that the average cholesterol drop can vary between individuals, and the response to treatment may differ. Consult with a healthcare professional for personalized advice and treatment options.

Sources:

1. Baigent, C., Blackburn, R., Emberson, J., Holland, L. E., Reith, C., & Yusuf, S. (2005). Efficacy and safety of more intensive lowering of LDL cholesterol: a meta-analysis of data from 11 randomised controlled trials. The Lancet, 366(9500), 1623-1634. <https://doi.org/10.1016/S0140-6736(05)67665-7>
2. La Rosa, J. P., Wenger, N. K., Grundy, S. M., Waters, D. D., Shepherd, J., Hunninghake, D. B., ... & Sacks, F. M. (1990). Comparative effects of lipid-altering therapies on coronary atherosclerosis: a meta-analysis. Journal of the American Medical Association, 263(21), 2983-2990. <https://doi.org/10.1001/jama.1990.03450210065033>
3. DrugPatentWatch.com. (n.d.). Atorvastatin (Lipitor) Patent Expiration & Generics. Retrieved from <https://www.drugpatentwatch.com/patent/atorvastatin-lipitor-patent-expiration-generics/>