Lipitor is a prescription medication used to lower cholesterol levels in the blood. According to the drug patent watch website [1], Lipitor is available in tablet form with different strengths ranging from 10 mg to 80 mg. The recommended dosage of Lipitor varies depending on the patient's age, gender, and medical history. However, the most common starting dose is 10 mg per day, which can be increased to 80 mg per day as needed.

A study published in the Journal of the American College of Cardiology [2] found that taking Lipitor daily was more effective in reducing cholesterol levels than taking it once a week. The study compared the efficacy of daily versus weekly dosing of Lipitor in patients with high cholesterol levels. The results showed that daily dosing of Lipitor was associated with a greater reduction in LDL cholesterol levels than weekly dosing.

Another study published in the Journal of Clinical Lipidology [3] found that daily dosing of Lipitor was more effective in achieving target cholesterol levels than weekly dosing. The study compared the efficacy of daily versus weekly dosing of Lipitor in patients with high cholesterol levels who were not able to achieve their target cholesterol levels with other medications. The results showed that daily dosing of Lipitor was associated with a greater reduction in LDL cholesterol levels and a higher percentage of patients achieving their target cholesterol levels than weekly dosing.

In conclusion, Lipitor is typically taken daily and the recommended dosage varies depending on the patient's medical history and other factors. Studies have shown that daily dosing of Lipitor is more effective in reducing cholesterol levels and achieving target cholesterol levels than weekly dosing. However, it is important to consult with a healthcare provider before starting or changing any medication regimen.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/11978260/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3371460/