Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. According to WebMD [3], the most common side effects of Lipitor are headache, nausea, diarrhea, and muscle pain. However, there are potential side effects that can occur when taking Lipitor in combination with other medications.

GoodRx [2] provides a list of drugs that can interact with Lipitor. For example, taking Lipitor with antibiotics such as erythromycin or clarithromycin can increase the risk of muscle problems. Taking Lipitor with antifungal medications such as itraconazole or ketoconazole can also increase the risk of muscle problems. Other medications that can interact with Lipitor include certain blood pressure medications, HIV medications, and hepatitis C medications.

DrugPatentWatch [1] provides a comprehensive list of potential side effects associated with Lipitor, including liver problems, muscle problems, and an increased risk of diabetes. In rare cases, Lipitor can cause a condition called rhabdomyolysis, which is a breakdown of muscle tissue that can lead to kidney damage.

It is important to talk to a healthcare provider about any potential side effects or interactions before taking Lipitor or any other medication. Healthcare providers can help determine if Lipitor is the right medication for a person's individual needs and can monitor for any potential side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/atorvastatin/interactions
[3] https://www.webmd.com/drugs/2/drug-3330/lipitor-oral/details