Lipitor is a prescription drug used to lower cholesterol levels in the blood. It belongs to a class of drugs known as statins. According to the sources provided, Lipitor is available in tablet form, and the dosage prescribed by a doctor depends on the patient's medical condition and response to treatment [2].

The recommended starting dose of Lipitor is usually 10 or 20 mg once daily, and the maximum dose is 80 mg once daily [3]. The dosage may be adjusted by the doctor based on the patient's cholesterol levels and other factors. It is important to take Lipitor as directed by the doctor and not to exceed the recommended dose.

The effectiveness of Lipitor depends on various factors, including the patient's medical condition, the dosage prescribed, and how well the patient follows the treatment plan. According to Drug Patent Watch, Lipitor has been shown to significantly reduce LDL cholesterol levels in clinical studies [1]. However, the drug may not work for everyone, and some patients may need to try different medications or combinations of medications to achieve their target cholesterol levels.

In summary, Lipitor is a prescription drug used to lower cholesterol levels in the blood. The dosage prescribed by a doctor depends on the patient's medical condition and response to treatment. Lipitor has been shown to be effective in reducing LDL cholesterol levels in clinical studies, but the effectiveness may vary depending on the patient. It is important to take Lipitor as directed by the doctor and not to exceed the recommended dose.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.healthline.com/health/drugs/lipitor-dosage
[3] https://medlineplus.gov/druginfo/meds/a600045.html