Green Tea and Medical Interaction

When I grew up in the Far East, I was always told to avoid drinking tea when taking medication.

This is because tea interferes with the absorption and activity of medications such as those listed below:

• Acetaminophen with Codeine
  
• Adenosine
  
• Atropine
  
• Antibiotics
  
• Cardec DM®
  
• Codeine
  
• Ephedrine and Pseudoephedrine
  
• Lomotil®/Lonox®
  
• Theophylline/Aminophylline
  
• Warfarin
  
• Anti-psychotics
  
• Beta blockers
  
• Blood thinners
  
• MAOIs
  
• Sedatives
  
• Some cough, cold, and weight loss products

Green tea may contain vitamin K, which, when used in large quantities, can reduce the blood thinning effects of warfarin (Coumadin®), a phenomenon that has been reported in a human case.

Based on preliminary data, green tea may lower LDL cholesterol, and thus may theoretically interact with other cholesterol-lowering drugs.

Green tea also contains caffeine that can interact with certain drugs, heightening their effects to dangerous levels. These drugs include:

• Aminophylline
  
• Ephedrine
  
• Pseudoephedrine
  
• Theophylline

As a safety precaution, avoid drinking tea for at least 2 hours after taking medications.

If you are taking any prescription or over-the-counter supplement, you should consult with a doctor before drinking green tea.

Medline Plus: Green Tea (Carmellia sinensis). http://www.nlm.nih.gov/medlineplus/print/druginfo/natural/patient-green_tea.html.

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