Atorvastatin, marketed under the brand name Lipitor, is a medication used to lower cholesterol levels in the blood. According to the sources provided, there are several drug interactions that have been reported with Lipitor.

The first source [1] indicates that there are several patents for Lipitor, but does not provide information on drug interactions. However, the second and third sources [2][3] provide a list of drugs that may interact with atorvastatin.

According to Drugs.com [2], atorvastatin may interact with medications such as cyclosporine, gemfibrozil, and niacin, which can increase the risk of muscle problems. Additionally, atorvastatin may interact with anticoagulants such as warfarin, increasing the risk of bleeding.

GoodRx [3] also lists several medications that may interact with atorvastatin, including antibiotics such as erythromycin and clarithromycin, which can increase the risk of muscle problems. Other medications that may interact with atorvastatin include calcium channel blockers, HIV medications, and medications used to treat depression.

It is important to note that this is not a comprehensive list of all possible drug interactions with atorvastatin. Patients should always inform their healthcare provider of all medications they are taking, including prescription drugs, over-the-counter medications, and supplements, to avoid potential interactions.

In conclusion, while the first source [1] did not provide information on drug interactions, the second and third sources [2][3] indicate that there are several medications that may interact with atorvastatin. Patients should always consult with their healthcare provider before taking any new medications while on Lipitor to avoid potential interactions.

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