Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to [2], the dosage of Lipitor is adjusted regularly to achieve the desired cholesterol-lowering effect while minimizing the risk of side effects. The recommended starting dose of Lipitor is 10 to 20 mg once daily, and the maximum dose is 80 mg once daily. The dosage may be adjusted based on the patient's response to the medication, their cholesterol levels, and other factors such as age, gender, and medical history.

The dosage of Lipitor may also be adjusted based on the patient's risk of developing cardiovascular disease. According to [3], patients with a higher risk of cardiovascular disease may require a higher dose of Lipitor to achieve the desired cholesterol-lowering effect. In contrast, patients with a lower risk of cardiovascular disease may require a lower dose of Lipitor to achieve the same effect.

It is important to note that Lipitor may interact with other medications, and the dosage may need to be adjusted accordingly. For example, [2] states that the use of certain medications such as cyclosporine, gemfibrozil, and niacin may increase the risk of side effects when taken with Lipitor. Therefore, the dosage of Lipitor may need to be adjusted when used in combination with these medications.

In summary, the dosage of Lipitor is adjusted regularly to achieve the desired cholesterol-lowering effect while minimizing the risk of side effects. The dosage may be adjusted based on the patient's response to the medication, their cholesterol levels, their risk of developing cardiovascular disease, and other factors such as age, gender, and medical history. It is important to consult with a healthcare provider before making any changes to the dosage of Lipitor or any other medication.

Sources:
[2] Medscape - Lipitor (atorvastatin)
[3] American Family Physician - Managing Dyslipidemia with Statins: Review of Evidence-Based Clinical Strategies