What is green tea?
Green tea has been used in alternative medicine as a probably effective aid in the treatment of genital warts, high cholesterol, and to keep the mind alert.
Green tea has been used in alternative medicine as a possibly effective aid in the treatment of clogged arteries, ovarian and endometrial cancer, low blood pressure, osteoporosis, changes in the cells of the cervix by the human papillomavirus (HPV, for white aches), prevention of Parkinson’s disease.
Other uses not proven by research include various cancers (bladder, esophagus, pancreas, breast, colon, stomach, leukemia, mouth, prostate, lung); acne, heart disease, diabetes, infertility, high blood pressure, obesity, respiratory infections, improvement of athletic performance, wrinkles and others.
There is no certainty that green tea is effective in treating any medical condition. The medicinal use of this product has not been approved by the FDA. Green tea should not be used as a substitute for prescription drugs.
Green tea is frequently sold as an herbal supplement. There are no laws regulating the standardized manufacturing of herbal products, and some of these products for sale have been found to have been contaminated with toxic metals or other drugs. Herbal and / or health supplements should be obtained from trusted locations to reduce the risk of contamination.
Green tea can also be used for purposes not mentioned in this product guide.
What is the most important information I should know about green tea?
Follow all instructions on the product label and package. Tell each of your healthcare providers about all of your medical conditions, allergies, and all the medications you are using.
What should I discuss with my healthcare provider before drinking green tea?
Before using green tea, talk to your healthcare provider. You may not be able to use green tea if you have certain medical conditions.
Ask your doctor, pharmacist, or other healthcare providers if you can safely use this product if you have:
- anxiety disorders;
- bleeding or blood clotting disorders;
- heart disease;
- high blood pressure;
- irritable bowel syndrome;
- osteoporosis; or
- liver disease.
Green tea is considered possibly safe for use during pregnancy in moderate amounts (2 cups a day).
The caffeine in green tea can pass into breast milk and affect the nursing baby. Do not drink green tea excessively if you are breast-feeding a baby.
Green tea is possibly safe for children in low amounts (equivalent to the caffeine found in other foods).
How should I drink green tea?
If you are considering using an herbal supplement, seek the advice of your doctor. You may also seek the advice of an expert trained in the use of herbal / health supplements.
If you decide to use green tea, follow the directions on the label or what your doctor, pharmacist, or other healthcare provider has told you. Do not use larger amounts than recommended on the label.
Do not use different forms of green tea (such as tablets, extracts, and others) together at the same time without medical advice. Using different forms together can increase your risk of an overdose.
Call your doctor if the condition you are treating with green tea does not improve, or if it worsens while using this product.
If you need a cardiac stress test, stop taking green tea at least 24 hours before your test.
Store at room temperature away from moisture and heat.
What happens if I skip a dosage?
Skip the missed dose if it is almost time for the next dose. Do not use more green tea to make up the missed dose.
What would happen with an overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. Taking green tea in very high amounts can cause headaches, nervousness, sleep problems, vomiting, diarrhea, an irregular heartbeat, dizziness, and seizures and can be dangerous and potentially fatal.
What should I avoid while drinking green tea?
Follow your healthcare provider’s instructions about any restrictions on food, drinks, or activities.
Avoid using green tea in conjunction with other herbal / health supplements that can also affect blood clotting. This includes angelica (dong quai), capsicum, clove, danshen, garlic, ginger, ginkgo, horse chestnut, Panax ginseng, poplar, red clover, saw palmetto, turmeric, and willow.
Drinking alcohol with this product can cause side effects including restlessness, headache, and a fast heartbeat.
Avoid using stimulant drugs like cocaine or amphetamines when using this product.
What are the possible side effects of green tea?
Seek emergency medical attention if you have symptoms of an allergic reaction: hives; difficulty breathing; swelling of the face, lips, tongue, or throat.
Although not all side effects are known, green tea is believed to be possibly safe as long as it is taken by mouth in moderate amounts or used on the skin.
Stop using green tea and call your healthcare provider right away if you have:
- unusual bleeding or any bleeding that won’t stop.
Common side effects may include:
- stomach upset and constipation.
Green tea has been reported to cause liver damage in rare cases.
This list does not mention all the side effects and others may occur. Call your doctor for medical advice related to side effects. You can report side effects by calling the FDA at 1-800-FDA-1088.
What other drugs will affect green tea?
Other drugs can interact with green tea, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your healthcare providers about all the medications you are using now, and any medications you start or stop using.
Do not take green tea without medical advice if you are using any of the following medications:
- adenosine (Adenocard);
- stimulant drugs (amphetamines, ephedrine, nicotine, others);
- nadolol (Corgard);
- asthma medicine;
- medications for depression or mental disorders;
- Medicines that affect blood clotting: (Normiflo), aspirin, clopidogrel (Plavix), diclofenac (Voltaren, Cataflam, others), dipyridamole (Persantine), ibuprofen (Advil, Motrin, others), naproxen (Anaprox, Naprosyn, others ), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, ticlopidine (Ticlid), warfarin (Coumadin), and others;
- any medicine to treat cancer;
- estrogens and birth control pills;
- any antibiotic or medicine for yeast infections;
- seizure medicine;
- any medicine for heart disease.