Lipitor is a prescription medication used to lower cholesterol levels in the blood. According to the sources provided, it is generally safe to take antacids while on Lipitor, but caution should be exercised as some antacids may interfere with the absorption of the medication. Lipitor should be taken at least two hours before or four hours after taking antacids to avoid any potential interaction [2][3]. It is important to note that any medication interaction should be discussed with a healthcare provider, including over-the-counter medications, vitamins, and supplements. Additionally, patients should always follow the dosing instructions provided by their healthcare provider and not make any changes without consulting them first [2].

Sources:
[2] https://www.peacehealth.org/medical-topics/id/hn-1090009
[3] https://www.verywellhealth.com/statin-side-effects-and-drug-interactions-698202