Acetaminophen is a commonly used pain reliever, and Lipitor is a medication used to lower cholesterol levels. According to the sources provided, there is no specific recommended dosage of acetaminophen when taken with Lipitor. However, it is important to note that both medications can have an impact on liver function, and excessive use of acetaminophen can lead to liver damage. Therefore, it is important to follow the recommended dosage of acetaminophen and to avoid taking more than 4,000 milligrams per day. Additionally, it is recommended to consult with a healthcare provider before taking any new medications, including acetaminophen and Lipitor, especially if there is a history of liver problems or other medical conditions. It is also important to monitor liver function while taking these medications.

Sources:
[1] Drug Patent Watch. ACETAMINOPHEN. https://www.drugpatentwatch.com/p/tradename/ACETAMINOPHEN
[2] National Center for Biotechnology Information. Statins and the Liver. https://www.ncbi.nlm.nih.gov/books/NBK548162/
[3] American College of Gastroenterology. Medications and the Liver. https://gi.org/topics/medications-and-the-liver/