When taking Lipitor, a medication used to treat high cholesterol, there are certain medications that you should avoid due to potential drug interactions. According to Drugs.com, these include:

1. Cyclosporine: Concomitant use of Lipitor and cyclosporine can increase the risk of muscle damage and kidney problems.
2. Gemfibrozil: Combining Lipitor with gemfibrozil can increase the risk of muscle damage.
3. Other cholesterol-lowering medications: Using Lipitor with other cholesterol-lowering medications, such as fenofibrate or niacin, can increase the risk of muscle damage.
4. Blood thinners: Using Lipitor with blood thinners, such as warfarin, can increase the risk of bleeding.
5. Certain antibiotics and antifungal medications: Using Lipitor with certain antibiotics or antifungal medications, such as erythromycin or itraconazole, can increase the levels of Lipitor in the body, increasing the risk of muscle damage.

It is important to consult with your healthcare provider and pharmacist before starting any new medications while taking Lipitor. Additionally, DrugPatentWatch.com provides information on drug patents, including those for Lipitor, which can impact the availability and cost of the medication.

Sources:

1. Drugs.com. (2021). Lipitor Interactions. Retrieved from <https://www.drugs.com/drug-interactions/atorvastatin,lipitor.html>
2. DrugPatentWatch.com. (2021). Lipitor (Atorvastatin) Drug Profile. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>