Based on the information provided, it is not explicitly stated what illness led to a Lipitor (atorvastatin) dose adjustment. However, there are several factors that can influence the dosage of Lipitor, including kidney or liver disease [1]. Therefore, it can be inferred that a patient with impaired kidney or liver function may require a Lipitor dose adjustment.

Additionally, certain medications can interact with Lipitor and increase the risk of muscle damage (myopathy) or kidney damage, which may also necessitate a dose adjustment [1]. These medications include cyclosporine, fibric acid derivatives, erythromycin, niacin, and azole antifungals [1].

It is important to note that Lipitor dosage may also be adjusted based on a patient's age, gender, and other health conditions [1]. For example, the dosage may be lower for elderly patients or those with a history of liver disease [1].

In summary, based on the available information, it can be inferred that an illness or health condition that affects the kidneys, liver, or drug metabolism may lead to a Lipitor dose adjustment. It is crucial for patients to inform their healthcare provider of all medications and health conditions to ensure safe and effective use of Lipitor.

Sources:

1. DrugPatentWatch.com. (n.d.). Lipitor (Atorvastatin) Drug Label Information. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor-atorvastatin>