The safe dosage levels for Lipitor, a medication used to treat high cholesterol, are typically determined by a patient's health status, age, and other factors. According to the drug's official website [1], the usual starting dosage for adults is 10 to 20 milligrams (mg) per day, taken orally, with or without food. The maximum recommended dosage is 80 mg per day.

However, individualized dosage adjustments may be necessary for certain populations. For instance, in patients with severe kidney disease, the initial dosage should not exceed 10 mg per day [1]. Additionally, in elderly patients, the starting dosage should be 10 mg per day, and the drug's effectiveness and safety should be closely monitored [1].

It is crucial to note that Lipitor should not be taken in higher doses or more frequently than prescribed, as this may increase the risk of serious side effects, such as muscle damage, liver problems, and kidney issues [1].

Furthermore, Lipitor interacts with several other medications, which may affect its safety and efficacy [1]. Therefore, it is essential to inform healthcare providers of all medications, supplements, and herbal products being taken before starting Lipitor.

In summary, the safe dosage levels for Lipitor typically range from 10 to 20 mg per day for most adults, with a maximum recommended dosage of 80 mg per day. However, individualized dosage adjustments may be necessary for certain populations, and it is crucial to follow the prescribing healthcare provider's instructions carefully.

Sources:
[1] Lipitor (atorvastatin) [Prescribing Information]. Pfizer Labs; 2021. Accessed: March 16, 2023. <https://www.lipitor.com/pdf/PI.pdf>
[2] DrugPatentWatch.com. Atorvastatin Calcium. Accessed: March 16, 2023. <https://www.drugpatentwatch.com/drugs/atorvastatin-calcium>