Lipitor, also known as atorvastatin, is a prescription medication used to lower cholesterol levels in the blood. According to the sources provided, Lipitor can interact with other medications, which may increase the risk of side effects or reduce the effectiveness of the medication.

DrugPatentWatch [1] lists several drugs that may interact with Lipitor, including drugs that can increase the risk of muscle damage (such as gemfibrozil), drugs that can increase the risk of bleeding (such as warfarin), and drugs that can increase the concentration of Lipitor in the blood (such as cyclosporine).

GoodRx [2] also provides a list of drugs that may interact with Lipitor, including antibiotics (such as erythromycin), antifungal medications (such as fluconazole), and HIV medications (such as ritonavir).

Drugs.com [3] provides a more comprehensive list of potential drug interactions with Lipitor, including drugs that can increase the risk of muscle damage (such as colchicine), drugs that can increase the risk of bleeding (such as dabigatran), and drugs that can reduce the effectiveness of Lipitor (such as rifampin).

It is important to inform your healthcare provider of all medications, including prescription, over-the-counter, and herbal supplements, that you are taking before starting Lipitor. This can help to reduce the risk of potential drug interactions and ensure that Lipitor is safe and effective for you.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/atorvastatin/interactions
[3] https://www.drugs.com/drug-interactions/atorvastatin,lipitor.html