Potential Drug Interactions

Given quercetin’s potent effects, it may enhance or interfere with certain prescribed medications and treatments, such as:

  • Blood thinners.17
  • Chemotherapy agents doxorubicin and cisplatin.17
  • Corticosteroids.17
  • Liver-Metabolized Drugs—may increase the effects and side effects of cyclosporine and other drugs processed in the liver by slowing down the metabolic process.17-19
  • Quinolone antibiotics—may reduce the efficacy of these types of antibiotics, also known as fluoroquinolones.4,10

By inhibiting actions of the protein in cell membranes responsible for transporting a number of different drugs (e.g., Cardizem®, Zantac™, Allegra®, and Lanoxin™), quercetin may increase the absorption and the risk of side effects.19

An immunosuppressant drug typically used to treat
rheumatoid arthritis and psoriasis.
Disclaimer: This website is not intended to replace professional consultation, diagnosis, or treatment by a licensed physician. If you require any medical related advice, contact your physician promptly. Information at is exclusively of a general reference nature. Do not disregard medical advice or delay treatment as a result of accessing information at this site.