Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood, while vitamin C is a dietary supplement commonly used to boost the immune system.

According to Drug Patent Watch [1], there are no known drug interactions between Lipitor and vitamin C. However, the Mayo Clinic [2] suggests that taking high doses of vitamin C supplements may increase the risk of developing kidney stones, especially in people with a history of kidney stones. Additionally, taking high doses of vitamin C may interfere with the effectiveness of certain medications, including chemotherapy drugs, statins, and blood thinners.

A study published in the Journal of the American College of Cardiology [3] found that high-dose vitamin C supplements may reduce the effectiveness of statins, including Lipitor, in lowering LDL cholesterol levels. The study also suggested that taking high doses of vitamin C supplements may increase the risk of cardiovascular disease in people taking statins.

In conclusion, there are no known drug interactions between Lipitor and vitamin C. However, taking high doses of vitamin C supplements may increase the risk of kidney stones and interfere with the effectiveness of certain medications, including statins. People taking Lipitor should consult with their healthcare provider before taking high doses of vitamin C supplements to avoid potential risks.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.mayoclinic.org/drugs-supplements-vitamin-c/art-20363932
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4621682/