Lipitor is a prescription drug that is used to lower cholesterol levels in the body. It is important to note that certain supplements and drugs can interact with Lipitor, which can lead to adverse side effects or reduce its effectiveness.

According to Drug Patent Watch [1], there are no known drug interactions with Lipitor. However, it is important to consult with a healthcare provider before taking any supplements or over-the-counter medications while on Lipitor.

SingleCare [2] notes that certain supplements, such as red yeast rice, can interact with Lipitor. Red yeast rice is a supplement that is used to lower cholesterol levels and can cause muscle pain and weakness when taken with statins like Lipitor. Other supplements that can interact with Lipitor include St. John's Wort, which can reduce the effectiveness of the drug, and coenzyme Q10, which can reduce the side effects of Lipitor.

ConsumerLab [3] also recommends avoiding grapefruit juice when taking Lipitor, as it can increase the levels of the drug in the body and lead to adverse side effects. Additionally, it is important to avoid taking certain antibiotics, such as erythromycin and clarithromycin, as they can also increase the levels of Lipitor in the body.

In conclusion, while there are no known drug interactions with Lipitor, it is important to consult with a healthcare provider before taking any supplements or over-the-counter medications while on Lipitor. Certain supplements, such as red yeast rice, St. John's Wort, and coenzyme Q10, can interact with Lipitor and cause adverse side effects. It is also important to avoid grapefruit juice and certain antibiotics while on Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.singlecare.com/blog/atorvastatin-interactions/
[3] https://www.consumerlab.com/answers/which-drugs-should-be-avoided-when-taking-statins/statin-supplement-interactions/