Lipitor is a medication used to lower cholesterol levels in the blood, specifically low-density lipoprotein (LDL) cholesterol, which is commonly referred to as "bad" cholesterol. The effectiveness of Lipitor depends on various factors such as age, gender, diet, exercise, and dosage.

According to Drug Patent Watch [1], Lipitor (atorvastatin) is available in tablet form in several dosages, including 10mg, 20mg, 40mg, and 80mg. The recommended starting dose of Lipitor is usually 10-20mg once daily, and the maximum recommended dose is 80mg per day. The dosage may be adjusted based on individual needs and response to treatment.

Drugs.com [2] notes that the dosage of Lipitor depends on the patient's medical condition, response to treatment, and other medications they may be taking. The recommended starting dose for most adults is 10-20mg once daily, and the maximum dose is 80mg per day. Patients with severe kidney disease may require a lower dose of Lipitor.

Healthline [3] explains that lower dosages of Lipitor can be effective in lowering LDL cholesterol levels. A study published in the Journal of the American Medical Association found that a 10mg dose of Lipitor was effective in reducing LDL cholesterol levels by 30%, while a 80mg dose reduced LDL cholesterol levels by 47%. The study also found that the lower dose of Lipitor had fewer side effects than the higher dose.

In conclusion, Lipitor is an effective medication for lowering cholesterol levels in the blood. The recommended starting dose is usually 10-20mg once daily, and the maximum recommended dose is 80mg per day. Lower dosages of Lipitor can be effective in reducing LDL cholesterol levels and may have fewer side effects than higher dosages. However, the dosage of Lipitor should be determined by a healthcare provider based on individual needs and response to treatment.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.drugs.com/dosage/lipitor.html
[3] https://www.healthline.com/health/drugs/lipitor-dosage