Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels. According to Drug Patent Watch [1], the most common side effects of Lipitor include headache, nausea, diarrhea, and muscle pain. However, combining Lipitor with certain supplements can potentially increase the risk of side effects.

ConsumerLab [2] recommends avoiding supplements containing red yeast rice when taking statins such as Lipitor. Red yeast rice contains monacolin K, which is chemically identical to the active ingredient in lovastatin, another cholesterol-lowering drug. Combining red yeast rice with statins can increase the risk of muscle pain and liver damage.

Mayo Clinic [3] also warns that red yeast rice can cause side effects similar to those of statins, including headache, stomach ache, and dizziness. Additionally, red yeast rice can interact with other medications, including birth control pills and blood thinners.

It is important to consult with a healthcare provider before taking any supplements while on Lipitor or any other medication. They can provide personalized recommendations and monitor for potential side effects or interactions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.consumerlab.com/answers/which-drugs-should-be-avoided-when-taking-statins/statin-supplement-interactions/
[3] https://www.mayoclinic.org/drugs-supplements-red-yeast-rice/art-20363074