Lipitor (atorvastatin) is a medication that is used to treat high cholesterol levels and reduce the risk of heart attack and stroke [2]. Dosage adjustments of Lipitor may be necessary based on several factors, including age, gender, medical conditions, and other medications that the patient is taking [1].

According to the drug patent watch, the recommended starting dose of Lipitor is usually 10-20 mg per day, which can be increased to a maximum of 80 mg per day [1]. The dose may be adjusted based on the patient's age, gender, and other medical conditions. For example, elderly patients or those with liver disease may require a lower dose of Lipitor to avoid adverse effects [1].

Additionally, the dosage of Lipitor may be adjusted based on the patient's response to treatment. According to the American Academy of Family Physicians, the goal of treatment with Lipitor is to reduce the patient's LDL cholesterol levels by at least 30% [3]. If the patient's cholesterol levels do not decrease enough with the initial dose, the dosage may be increased [3]. Conversely, if the patient experiences adverse effects such as muscle pain or weakness, the dosage may be decreased or discontinued [2].

Finally, other medications that the patient is taking may also affect the dosage of Lipitor. Certain medications, such as fibrates or niacin, may increase the risk of muscle-related adverse effects when taken with Lipitor, and the dosage of Lipitor may need to be adjusted accordingly [2].

In summary, the dosage of Lipitor may be adjusted based on several factors, including age, gender, medical conditions, response to treatment, and other medications that the patient is taking. Patients should always follow their healthcare provider's instructions regarding the appropriate dosage of Lipitor to take.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://reference.medscape.com/drug/lipitor-atorvaliq-atorvastatin-342446
[3] https://www.aafp.org/pubs/afp/issues/2007/0515/p1487.html