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Potential Drug Interactions

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

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  • 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.
 
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