Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. According to DrugPatentWatch [1], there are 174 drugs that may interact with Lipitor. These interactions can range from mild to severe and can affect the way Lipitor works or increase the risk of side effects.

Some of the medications that may interact with Lipitor include antibiotics like erythromycin and clarithromycin, antifungal medications like ketoconazole and itraconazole, and antiviral medications like ritonavir and lopinavir. These medications can increase the levels of Lipitor in the blood, which can increase the risk of side effects.

Other medications that may interact with Lipitor include blood thinners like warfarin and heparin, which can increase the risk of bleeding, and medications used to treat HIV like efavirenz and nevirapine, which can decrease the levels of Lipitor in the blood.

It is important to inform your healthcare provider of all medications you are taking, including prescription, over-the-counter, and herbal supplements, to avoid any potential interactions. Your healthcare provider may need to adjust your medication dose or monitor you more closely for side effects if you are taking Lipitor with other medications.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/atorvastatin/interactions
[3] https://www.verywellhealth.com/statin-side-effects-and-drug-interactions-698202