Lipitor, also known as atorvastatin, is a commonly prescribed medication for lowering cholesterol levels. It is essential to be aware of potential drug interactions to ensure its effectiveness and safety. According to sources, there are several drugs contraindicated with Lipitor. These include medications such as cyclosporine, gemfibrozil, and certain protease inhibitors used in the treatment of HIV. Additionally, some antibiotics like erythromycin and clarithromycin, as well as certain antifungal medications, can interact adversely with Lipitor. It is crucial to consult healthcare professionals before combining Lipitor with any other medications to avoid potential complications.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/atorvastatin/interactions
[3] https://www.nhs.uk/medicines/atorvastatin/taking-atorvastatin-with-other-medicines-and-herbal-supplements/