Green Tea

What Is Green Tea and How Does It Work?

Green Tea is an herb used in cancer (prevention), cognitive improvement, Crohn's disease, diuresis, genital warts, headaches, heart disease (prevention), Parkinson's disease (prevention), stomach disorders, weight loss (combination products), and hypercholesterolemia.

Green tea is possibly effective for listed uses.

Studies show benefit in prevention of bladder, esophageal, pancreatic cancer; negative results for stomach cancer.

Green Tea is available under the following different brand and other names: camellia sinensis, camellia thea, Chinese tea, Dexatrim (reformulated), green tea extract, GTE, Japanese tea, Matsu-cha tea, Theaceae, Theanine, and theifers.

Dosages of Green Tea

Suggested Dosing

  • 1-10 cups taken orally once daily; 1 teaspoon tea leaves/ 8 oz boiling water

Mental Alertness

  • 1 cup or 60 mg caffeine (3 cups = 240-320 mg polyphenols)


  • Greater than 10 cups/day

Dosage Considerations – Should be Given as Follows:

There are no dosage considerations for use of green tea.

What Are Side Effects Associated with Using Green Tea?

Side effects of green tea include:

What Other Drugs Interact with Green Tea?

If your doctor has directed you to use this medication, your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor, health care provider or pharmacist first.

  • Severe interactions of green tea include:
    • bortezomib
  • Serious interactions of green tea include:
    • There are no known serious reactions from the use of green tea.
  • Moderate interactions:
    • Green tea has moderate interactions with at least 110 different drugs.
  • Mild interactions:
    • Green Tea has known mild interactions with at least 37 different drugs.

This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist. Check with your physician if you have health questions or concerns.

What Are Warnings and Precautions for Green Tea?


This medication contains green tea. Do not take camellia sinensis, camellia thea, Chinese tea, Dexatrim (reformulated), green tea extract, GTE, Japanese tea, Matsu-cha tea, Theaceae, Theanine, or theifers if you are allergic to green tea or any ingredients contained in this drug.

Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center immediately.



  • Avoid prior to surgery: may cause bleeding.

Effects of Drug Abuse

  • Withdrawal symptoms

Short-Term Effects

  • No information available

Long-Term Effects

  • No information available


Pregnancy and Lactation

Do not use in pregnancy or lactation. Risks involved outweigh potential benefits. Safer alternatives exist.

Medscape. Green Tea.

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