Lipitor (atorvastatin) is a medication used to treat high cholesterol levels in the blood. The dosage of Lipitor may vary depending on the age of the patient. According to the prescribing information provided by the FDA [2], the recommended starting dose of Lipitor for adults is 10-20 mg once daily. The dosage may be increased up to 80 mg once daily depending on the patient's response and tolerance to the medication.

The recommended dosage of Lipitor for pediatric patients aged 10-17 years with heterozygous familial hypercholesterolemia is 10 mg once daily. The dosage may be increased up to 20 mg once daily depending on the patient's response and tolerance to the medication [2].

The Mayo Clinic [3] also provides information on the proper use of Lipitor. It is recommended to take Lipitor at the same time every day, with or without food. It is important to follow the dosage instructions provided by the healthcare provider and not to change the dosage without consulting them.

The drug patent watch [1] provides information on the availability of generic versions of Lipitor. This information can be useful for patients who are concerned about the cost of the medication.

In conclusion, the recommended dosage of Lipitor may vary depending on the age of the patient. The recommended starting dose for adults is 10-20 mg once daily, which may be increased up to 80 mg once daily. For pediatric patients aged 10-17 years with heterozygous familial hypercholesterolemia, the recommended dosage is 10 mg once daily, which may be increased up to 20 mg once daily. It is important to follow the dosage instructions provided by the healthcare provider and not to change the dosage without consulting them.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/020702s057lbl.pdf
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/proper-use/drg-20067003