Update of green tea interactions with cardiovascular drugs and putative mechanisms

José Pablo Werba, Shingen Misaka, Monica Gianna Giroli, Kenju Shimomura, Manuela Amato, Niccolò Simonelli, Lorenzo Vigo, Elena Tremoli

Research output: Contribution to journalReview articlepeer-review


Many patients treated with cardiovascular (CV) drugs drink green tea (GT), either as a cultural tradition or persuaded of its putative beneficial effects for health. Yet, GT may affect the pharmacokinetics and pharmacodynamics of CV compounds. Novel GT-CV drug interactions were reported for rosuvastatin, sildenafil and tacrolimus. Putative mechanisms involve inhibitory effects of GT catechins at the intestinal level on influx transporters OATP1A2 or OATP2B1 for rosuvastatin, on CYP3A for sildenafil and on both CYP3A and the efflux transporter p-glycoprotein for tacrolimus. These interactions, which add to those previously described with simvastatin, nadolol and warfarin, might lead, in some cases, to reduced drug efficacy or risk of drug toxicity. Oddly, available data on GT interaction with CV compounds with a narrow therapeutic index, such as warfarin and tacrolimus, derive from single case reports. Conversely, GT interactions with simvastatin, rosuvastatin, nadolol and sildenafil were documented through pharmacokinetic studies. In these, the effect of GT or GT derivatives on drug exposure was mild to moderate, but a high inter-individual variability was observed. Further investigations, including studies on the effect of the dose and the time of GT intake are necessary to understand more in depth the clinical relevance of GT-CV drug interactions.

Original languageEnglish
Pages (from-to)S72-S77
JournalJournal of Food and Drug Analysis
Issue number2
Publication statusPublished - Apr 1 2018


  • Cardiovascular drugs
  • Green tea
  • Herb–drug interactions

ASJC Scopus subject areas

  • Food Science
  • Pharmacology


Dive into the research topics of 'Update of green tea interactions with cardiovascular drugs and putative mechanisms'. Together they form a unique fingerprint.

Cite this