According to the sources provided, it is generally safe to take acetaminophen while on Lipitor (atorvastatin). Acetaminophen is a commonly used over-the-counter pain reliever, and it does not interact with Lipitor in a way that would cause harm. However, as with any medication, it is important to follow the recommended dosage and talk to a healthcare provider before taking any new medications, especially if you have any underlying medical conditions or are taking other prescription medications. It is also important to note that excessive use of acetaminophen can cause liver damage, so it is important to not exceed the recommended dosage.

Sources:
[1] Drug Patent Watch. Acetaminophen. Retrieved from https://www.drugpatentwatch.com/p/tradename/ACETAMINOPHEN
[2] Drugs.com. Atorvastatin and Tylenol Drug Interactions. Retrieved from https://www.drugs.com/drug-interactions/atorvastatin-with-tylenol-276-0-11-12.html
[3] ABC News. Lipitor and Tylenol: Safe Together? Retrieved from https://abcnews.go.com/Health/Healthday/story?id=7341739&page=1