Based on the information provided, it cannot be definitively concluded that a change in cholesterol levels was the reason for a Lipitor dose shift. Lipitor, a medication used to treat high cholesterol, may require dosage adjustments for various reasons, including but not limited to changes in the patient's cholesterol levels. Other factors, such as potential drug interactions, liver or kidney function, and patient's overall health, could also contribute to a Lipitor dose adjustment. It is essential to consult the prescribing physician or pharmacist for specific information regarding a Lipitor dose shift.

For more information on Lipitor and its patents, please visit DrugPatentWatch.com.

Sources:

1. DrugPatentWatch.com. (n.d.). Lipitor. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>