GREEN TEA

OTHER NAME(S):

Benifuuki, Camellia sinensis, Camellia thea, Camellia theifera, Constituant Polyphénolique de Thé Vert, CPTV, EGCG, Epigallo Catechin Gallate, Épigallo-Catéchine Gallate, Epigallocatechin Gallate, Extrait de Camellia Sinensis, Extrait de Thé, Extrait de Thé Vert, Extrait de Thea Sinensis, Green Sencha Tea, Green Tea Extract, Green Tea Polyphenolic Fraction, GTP, GTPF, Japanese Sencha Green Tea, Japanese Tea, Kunecatechins, Poly E, Polyphenon E, PTV, Té Verde, Tea, Tea Extract, Tea Green, Thé, Thé de Camillia, Thé Japonais, Thé Vert, Thé Vert de Yame, Thé Vert Sensha, Thea bohea, Thea sinensis, Thea viridis, Yame Green Tea, Yabukita, Yame Tea.<br/><br/>

Overview

Overview Information

Green tea is made from the Camellia sinensis plant. The dried leaves and leaf buds of Camellia sinensis are used to produce various types of teas. Green tea is prepared by steaming and pan-frying these leaves and then drying them. Other teas such as black tea and oolong tea involve processes in which the leaves are fermented (black tea) or partially fermented (oolong tea).

Green tea is taken by mouth to improve mental alertness and thinking.

It is also taken by mouth for depression, non-alcoholicfatty liver disease (NAFLD), inflammatory bowel disease (ulcerative colitis or Crohn's disease), weight loss and to treat stomach disorders, vomiting, diarrhea, headaches, and bone loss (osteoporosis).

Some people take green tea by mouth to prevent various cancers, including breast cancer, prostate cancer, colon cancer, gastric cancer, lung cancer, liver cancer, solid tumor cancers, leukemia, and skin cancer related to exposure to sunlight. Some women use green tea to fight human papilloma virus (HPV), which can cause genital warts, the growth of abnormal cells in the cervix (cervical dysplasia), and cervical cancer.

Green tea is also taken by mouth for Parkinson's disease, diseases of the heart and blood vessels, diabetes, low blood pressure, chronic fatigue syndrome (CFS), dental cavities (caries), kidney stones, and skin damage.

Instead of drinking green tea, some people apply green tea bags to their skin to soothe sunburn and prevent skin cancer due to sun exposure. Green tea bags are also used to decrease puffiness under the eyes, as a compress for tired eyes or headache, and to stop gums from bleeding after a tooth is pulled. A green tea footbath is used for athlete's foot.

Some people gargle with green tea to prevent colds and flu. Green tea extract is also used in mouthwash to reduce pain after tooth removal. Green tea in candy is used for gum disease.

Green tea is used in an ointment for genital warts.

In food, people drink green tea as a beverage

How does it work?

The useful parts of green tea are the leaf bud, leaf, and stem. Green tea is not fermented and is produced by steaming fresh leaves at high temperatures. During this process, it is able to maintain important molecules called polyphenols, which seem to be responsible for many of the benefits of green tea.

Polyphenols might be able to prevent inflammation and swelling, protect cartilage between the bones, and lessen joint degeneration. They also seem to be able to fight human papilloma virus (HPV) infections and reduce the growth of abnormal cells in the cervix (cervical dysplasia). Research cannot yet explain how this works.

Green tea contains 2% to 4% caffeine, which affects thinking and alertness, increases urine output, and may improve the function of brain messengers important in Parkinson's disease. Caffeine is thought to stimulate the nervous system, heart, and muscles by increasing the release of certain chemicals in the brain called "neurotransmitters."

Antioxidants and other substances in green tea might help protect the heart and blood vessels.

Uses

Uses & Effectiveness?

Likely Effective for

  • Genital warts. A specific green tea extract ointment (Veregen, Bradley Pharmaceuticals; Polyphenon E ointment 15%, MediGene AG) is FDA-approved for treating genital warts. Applying the ointment for 10-16 weeks seems to clear these types of warts in 24% to 60% of patients.
  • High cholesterol. People to consume higher amounts of green tea seem to have lower levels of cholesterol, low-density lipoprotein (LDL or "bad") cholesterol, and triglycerides, as well as higher levels of high-density lipoprotein (HDL or "good") cholesterol. Consuming green tea or taking green tea extract containing 150 to 2500 mg of green tea catechins, an antioxidant found in green tea, daily for up to 24 weeks reduces total cholesterol and low-density lipoprotein (LDL or "bad") cholesterol in people with high levels of blood fats or cholesterol.

Possibly Effective for

  • Abnormal development of cells of the cervix (cervical dysplasia). Taking green tea by mouth or applying it to the skin seems to reduce cervical dysplasia caused by human papilloma virus (HPV) infection.
  • Clogged arteries (coronary artery disease). Population studies suggest that drinking green tea is linked to a reduced risk of clogged arteries. The link seems to be stronger in men than women.
  • Endometrial cancer. Population studies suggest that drinking green tea is linked to a reduced risk of developing endometrial cancer.
  • High blood pressure. There is some conflicting evidence about the effects of tea on high blood pressure. Population research in Chinese people shows that drinking 120-599 mL of green tea or oolong tea daily is linked to a lower risk of developing high blood pressure. Drinking more than 600 mL daily is linked to an even lower risk. Also, early clinical research suggests that taking green tea extract daily for 3 months or drinking green tea three times per day for 4 weeks reduces blood pressure in people with high blood pressure. Analysis of clinical research shows that green tea can reduce systolic blood pressure (the top number) by up to 3.2 mmHg and diastolic blood pressure (the bottom number) by up to 3.4 mmHg in people with or without high blood pressure. But several smaller studies show that green and black tea have no effect on blood pressure.
  • Low blood pressure. Drinking green tea might help increase blood pressure in elderly people who have low blood pressure after eating.
  • Thick, white patches on the gums (oral leukoplakia). Drinking green tea seems to decrease the size of white patches in people with oral leukoplakia.
  • Ovarian cancer. Women who regularly drink tea, including green or black tea, appear to have a lower risk of developing ovarian cancer. But green tea does not seem to prevent ovarian cancer from recurring in people with a history of ovarian cancer.
  • Parkinson's disease. Drinking one to four cups of green tea daily seems to provide the most protection against developing Parkinson's disease.

Insufficient Evidence for

  • Acne. Early research suggests that applying a solution containing a certain chemical found in green tea to the skin for 8 weeks reduces acne.
  • Abnormal protein buildup in the organs (Amyloidosis). Early research suggests that drinking green tea (Green Darjeeling, FTGFOP1, Teekampagne Projektwerkstatt GmbH, Berlin, Germany) or taking green tea capsules (Praevent-loges, Dr. Loges + Co. GmbH, Winsen/Luhe, Germany) containing green tea extracts for 12 months protects against an increase in heart mass in people with amyloidosis affecting the heart.
  • Athletic performance. There is conflicting evidence about the effects of green tea on athletic performance. Some early research suggests that taking green tea extract as a beverage does not improve breathing or performance in people undergoing endurance training. However, other early research suggests that taking specific pills (Teavigo, Healthy Origins, Pittsburgh, PA) three times daily with meals for a total dose of seven pills, improves some breathing tests during exercise in healthy adults.
  • Bladder cancer. Some population evidence suggests that drinking green tea is linked to a lower risk of bladder cancer. However, some conflicting research suggests that green tea might not reduce the risk of developing bladder cancer.
  • Breast cancer. Population research suggests that drinking green tea is not linked to a reduced risk of breast cancer in Asian people. However, there is some evidence that it might be linked with a reduced risk of breast cancer development in Asian-Americans. Green tea might have different protective effects in people depending on their genotype. In people with early-stage but not late-stage breast cancer, drinking green tea seems to be linked with a reduced risk of breast cancer recurring.
  • Heart disease. Population studies suggest that drinking three or more cups of green tea daily is linked to a decreased risk of death from heart disease or any cause.
  • Cervical cancer. Research suggests that taking a specific type of green tea extract (Polyphenon E) daily for 4 months does not affect cervical cancer risk in women with HPV infection.
  • Colds and flu. Early research suggests that taking a combination of green tea extract (THEA-FLAN 90S, Ito-en Co, Tokyo, Japan) plus theanine (Suntheanine, Taiyo Kagaku Co, Mie, Japan) daily for 5 months lowers the risk of developing the flu. Other early research suggests that taking a specific combination product containing green tea and other ingredients (ImmuneGuard, Nutraceutical Holdings LLC, Orlando, FL) reduces cold and flu symptoms and the duration of illness. But other early research suggests that gargling with green tea (Kakegawa Tea Merchants Association) at least three times daily for 90 days does not prevent the flu in high school students.
  • Colon and rectal cancer. Most evidence suggests that drinking green tea is not linked with a reduced risk of colon or rectal cancer. However, some research suggests that consuming a high amount is linked to a reduce risk, particularly in women. Also taking green tea extract daily for 12 months seems to reduce the redevelopment of colon and rectal tumors (metachronous adenomas) in people who previously underwent surgery to treat colon and rectal tumors.
  • Depression. Population research suggests that Japanese adults who drink four or more cups of green tea daily have a 44% to 51% lower risk for depression than those who drink one cup or less.
  • Diabetes. Population research suggests that Japanese adults, particularly women, who drink 6 or more cups of green tea daily, have a lower risk of developing diabetes. Also, population research suggests that drinking at least one cup of green tea per week is linked with a lower risk of developing impaired fasting blood sugar in Chinese people. Impaired fasting blood sugar is a risk factor for developing type 2 diabetes. However, some research shows that drinking green tea three times per day does not help control blood sugar in people with prediabetes. Also, taking green tea extract does not seem to help control sugar or insulin levels in people who already have diabetes. Overall, some evidence suggests that drinking green tea might help prevent diabetes from developing. But most research suggests that drinking green tea or taking green tea extract does not help control blood sugar in people who already have diabetes.
  • Esophageal cancer. Some population research suggests that drinking green tea is linked to a reduced risk of esophageal cancer. But there is some conflicting research. Some research suggests that drinking green tea is linked to a reduced risk of esophageal cancer in only women, but not men. Also, some population research suggests that drinking green tea that is very hot is linked to an increased risk of esophageal cancer. Drinking decaffeinated green tea does not seem to benefit people already diagnosed with esophageal cancer.
  • Stomach cancer. There is conflicting evidence about the effects of green tea on stomach cancer risk. Some population research suggests that drinking at least 5 cups of green tea daily is not linked with a reduced risk of stomach cancer. But other population research suggests that drinking at least 10 cups of green tea daily is linked with a reduced risk of stomach cancer.
  • Fertility problems. Early research suggests that taking a specific product containing a mixture of Vitex agnus-castus extract, green tea extract, and L-arginine, as well as some vitamins and minerals (FertilityBlend, The Daily Wellness Company, Mountain View, CA) increases pregnancy rates in women who have trouble conceiving.
  • Allergy to Japanese cedar (pollinosis). Early research suggests that drinking a type of green tea called "Benifuuki" daily for 6-10 weeks before being exposed to Japanese cedar pollen can reduce allergy symptoms, including throat pain, nose blowing, and tears.
  • Leukemia. Population research suggests that Taiwanese people who drink higher amounts of green tea have a lower risk of developing leukemia. Other population research shows that Chinese people who drink at least one cup of green tea for at least 20 years have a lower risk of developing leukemia.
  • Liver cancer. Population research suggests that drinking green tea is not linked to a reduced risk of liver cancer.
  • Lung cancer. There is conflicting evidence about the effects of green tea on lung cancer risk. One population study suggests that drinking at least 5 cups of green tea daily is not linked with a reduced risk of death related to lung cancer. However, men who consume high amounts of phytoestrogens, chemicals found in green tea, have a lower risk of developing lung cancer. Also, some population research suggests that increasing green tea intake by two cups daily or drinking 7-10 cups of green tea daily is linked with a reduced risk of lung cancer.
  • Mental alertness. Green tea contains caffeine. Drinking beverages that contain caffeine seems to help people maintain mental alertness throughout the day. Combining caffeine with sugar as an "energy drink" seems to improve mental performance more than caffeine or sugar alone. However, there is conflicting evidence regarding green tea on mental alertness. Some research shows that taking a combination of green tea extract and L-theanine (LGNC-07, LG Household & Health Care, Ltd, Korea) improves memory and attention in people with mild mental problems. However, taking a single dose of a certain chemical in green tea called epigallocathechin-3-gallate (EGCG) does not seem to improve move or mental performance in healthy adults.
  • Metabolic syndrome. Early research suggests that taking 1000 mg of green tea extract daily or drinking four cups of green tea daily for 8 weeks does not improve blood pressure, cholesterol levels, or blood sugar in obese people with metabolic syndrome.
  • Nonalcoholic fatty liver disease (NAFLD). Research suggests that drinking green tea daily for 12 weeks does not affect body weight or body mass but does reduce body fat percentage and fatty liver disease severity in people with NAFLD.
  • Obesity. There is conflicting evidence about the effects of green tea in obese people. Some early research shows that taking green tea extract can slightly improve weight loss in obese people. Other early research shows that drinking green tea or green tea-containing beverages can reduce body weight and body mass index (BMI) in obese adults or children. Some multi-ingredient products containing green tea have also shown benefit for weight loss. In most cases, the benefit of green tea on weight loss seems to be linked with the amount of catechins or caffeine contained in the beverage or supplement. However, not all research shows benefit. The best evidence to date suggests that taking green tea that contains caffeine might slightly reduce body weight in overweight and obese patients compared to caffeine alone. But the amount of weight loss is small and probably not meaningful.
  • Mouth cancer. Population research suggests that drinking green tea is linked with a reduced risk of developing mouth cancer. Also, early research suggests that taking green tea extract three times daily after meals for 12 weeks increases healing responses in people with mouth cancer.
  • Osteoporosis. Early research found that drinking green tea for 10 years is linked to increased bone mineral density. Early research also shows that taking green tea extract daily for 24 weeks improves biomarkers of bone density in postmenopausal women with low bone density. But taking green tea extract does not seem to improve bone density in postmenopausal women when measured using bone density scanning.
  • Pancreatic cancer. Population research suggests that drinking green tea is linked to a reduced risk of pancreatic cancer.
  • Gum disease (periodontal disease). Chewing candy that contains green tea extract seems to control plaque build-up on the teeth and reduce gum swelling. Also population research suggests that drinking green tea is linked with a reduced risk of gum disease. Also, applying a gel containing green tea extract improves symptoms in people with long-term gum disease.
  • Pneumonia. Population research suggests that Japanese women who drink green tea have a lower risk of death from pneumonia compared to those who don't drink green tea.
  • Pain after surgery. Research suggests that using a mouthwash containing green tea extract twice daily beginning the day after tooth removal surgery reduces pain and the need to use painkillers.
  • Prostate cancer. Research shows that taking products containing green tea antioxidants reduces the risk of prostate cancer in high-risk patients. But most early research has found that drinking higher amounts of green tea is not linked with a reduced risk prostate cancer. Also, taking green tea or green tea extracts does not seem to slow the progression of prostate cancer that has already been diagnosed.
  • Stress. Early research suggests that taking a specific brand of green tea extract (Teavigo, DSM, Netherlands) by mouth for 7 days reduces stress and increases calmness in healthy people.
  • Stroke. According to one study in Japan, drinking 3 cups of green tea daily seems to be linked with a lower risk of having a stroke compared to drinking one cup or no tea.
  • Athlete's foot. Research suggests that using a footbath containing green tea extract (Sunphenon BG-3,Taiyo Kagaku Co. Ltd., Yokkaichi, Mie, Japan) for 15 minutes once daily for 12 weeks does not improve symptoms of athletes foot, but does improve skin condition.
  • Inflammatory bowel disease (ulcerative colitis). Early research suggests that taking a specific green tea product (Polyphenon E, Mitsui-Norin, Fujieda, Japan) twice daily for 8 weeks might improve inflammatory bowel disease and help people with this condition achieve remission.
  • Upper respiratory tract infection. Early research suggests that gargling and swallowing green tea (Morgentau, Ronnefeld KG, Germany) over 4 days is less effective than labdanum lozenges (CYSTUS052, Dr Pandalis Urheimische Medizin GmbH & Co. KG, Germany) for reducing symptoms of upper respiratory tract infections.
  • Wrinkled skin. Some early research suggests that taking green tea antioxidants twice daily for 2 years does not reduce the signs of sun damage to the face in women. Also, applying a green tea cream and taking green tea by mouth daily seems to improve some aspects of skin aging in women, but overall appearance of skin does not seem to improve. However, some early research shows that drinking a beverage containing green tea antioxidants improves skin roughness, hydration, and elasticity in middle-aged women.
  • Other conditions.
More evidence is needed to rate green tea for these uses.

Side Effects

Side Effects & Safety

Green tea is LIKELY SAFE for most adults when consumed as a drink in moderate amounts or when green tea extract is applied to the skin as a specific ointment (Veregen, Bradley Pharmaceuticals), short-term. Green tea extract is POSSIBLY SAFE for most people when taken by mouth for up to 2 years, when applied to the skin as other ointments short-term, or when used as a mouthwash short-term. In some people, green tea can cause stomach upset and constipation. Green tea extracts have been reported to cause liver and kidney problems in rare cases.

Green tea is POSSIBLY UNSAFE when taken by mouth long-term or in high-doses. It can cause side effects because of the caffeine. These side effects can range from mild to serious and include headache, nervousness, sleep problems, vomiting, diarrhea, irritability, irregular heartbeat, tremor, heartburn, dizziness, ringing in the ears, convulsions, and confusion. Green tea also contains a chemical that has been linked with liver injury when used in high doses.

Drinking very high doses of green tea is LIKELY UNSAFE and can actually be fatal. The fatal dose of caffeine in green tea is estimated to be 10-14 grams (150-200 mg per kilogram). Serious toxicity can occur at lower doses.

Special Precautions & Warnings:

Children: Green tea is POSSIBLY SAFE for children when used in amounts commonly found in foods and beverages or when used for gargling three times daily for up to 90 days. Not enough is known about safety of green tea extract when taken by mouth in children. However, cases of liver damage have been reported for adults who used green tea extract. Therefore, some experts recommend that children under the age of 18 years old do not take green tea extract.

Pregnancy and breast-feeding: If you are pregnant or breast-feeding, green tea in small amounts - about 2 cups per day - is POSSIBLY SAFE. This amount of green tea provides about 200 mg of caffeine. However, drinking more than 2 cups of green tea per day is POSSIBLY UNSAFE. Consuming more than 2 cups of green tea daily has been linked to an increased risk of miscarriage and other negative effects due to the caffeine content. Also, green tea might increase the risk of birth defects associated with folic acid deficiency. In women who are nursing, caffeine passes into breast milk and can affect a nursing infant. Don't drink an excessive amount of green tea if you are pregnant or breast-feeding.

"Tired blood" (anemia): Drinking green tea may make anemia worse.

Anxiety disorders: The caffeine in green tea might make anxiety worse.

Bleeding disorders: Caffeine in green tea might increase the risk of bleeding. Don't drink green tea if you have a bleeding disorder.

Heart conditions: Caffeine in green tea might cause irregular heartbeat.

Diabetes: Caffeine in green tea might affect blood sugar control. If you drink green tea and have diabetes, monitor your blood sugar carefully.

Diarrhea: Green tea contains caffeine. The caffeine in green tea, especially when taken in large amounts, can worsen diarrhea.

Glaucoma: Drinking green tea increases pressure inside the eye. The increase occurs within 30 minutes and lasts for at least 90 minutes.

High blood pressure: The caffeine in green tea might increase blood pressure in people with high blood pressure. However, this does not seem to occur in people who regularly drink green tea or other products that contain caffeine.

Irritable bowel syndrome (IBS): Green tea contains caffeine. The caffeine in green tea, especially when taken in large amounts, can worsen diarrhea and might worsen symptoms of IBS.

Liver disease: Green tea extract supplements have been linked to rare cases of liver damage. Green tea extracts might make liver disease worse. Talk to your doctor before taking a green tea extract. Tell your doctor if you have signs of liver damage such as yellowing skin, dark urine, or abdominal pain. Keep in mind that drinking green tea as a beverage is normal amounts is still probably safe.

Weak bones (osteoporosis): Drinking green tea can increase the amount of calcium that is flushed out in the urine. Caffeine should be limited to less than 300 mg per day (approximately 2-3 cups of green tea). It is possible to make up for some calcium loss caused by caffeine by taking calcium supplements.
Interactions

Interactions?

Major Interaction

Do not take this combination

!
  • Amphetamines interacts with GREEN TEA

    Stimulant drugs such as amphetamines speed up the nervous system. By speeding up the nervous system, stimulant medications can make you feel jittery and increase your heart rate. The caffeine in green tea might also speed up the nervous system. Taking green tea along with stimulant drugs might cause serious problems including increased heart rate and high blood pressure. Avoid taking stimulant drugs along with caffeine.

  • Cocaine interacts with GREEN TEA

    Stimulant drugs such as cocaine speed up the nervous system. By speeding up the nervous system, stimulant medications can make you feel jittery and increase your heart rate. The caffeine in green tea might also speed up the nervous system. Taking green tea along with stimulant drugs might cause serious problems including increased heart rate and high blood pressure. Avoid taking stimulant drugs along with caffeine.

  • Ephedrine interacts with GREEN TEA

    Stimulant drugs speed up the nervous system. Caffeine (contained in green tea) and ephedrine are both stimulant drugs. Taking green tea along with ephedrine might cause too much stimulation and sometimes serious side effects and heart problems. Do not take caffeine-containing products and ephedrine at the same time.

Moderate Interaction

Be cautious with this combination

!
  • Adenosine (Adenocard) interacts with GREEN TEA

    Green tea contains caffeine. The caffeine in green tea might block the affects of adenosine (Adenocard). Adenosine (Adenocard) is often used by doctors to do a test on the heart. This test is called a cardiac stress test. Stop consuming green tea or other caffeine-containing products at least 24 hours before a cardiac stress test.

  • Antibiotics (Quinolone antibiotics) interacts with GREEN TEA

    The body breaks down caffeine to get rid of it. Some antibiotics might decrease how quickly the body breaks down caffeine. Taking these antibiotics along with green tea can increase the risk of side effects including jitteriness, headache, increased heart rate, and other side effects.<br /> Some antibiotics that decrease how quickly the body breaks down caffeine include ciprofloxacin (Cipro), enoxacin (Penetrex), norfloxacin (Chibroxin, Noroxin), sparfloxacin (Zagam), trovafloxacin (Trovan), and grepafloxacin (Raxar).

  • Birth control pills (Contraceptive drugs) interacts with GREEN TEA

    The body breaks down the caffeine in green tea to get rid of it. Birth control pills can decrease how quickly the body breaks down caffeine. Taking green tea along with birth control pills can cause jitteriness, headache, fast heartbeat, and other side effects.<br /> Some birth control pills include ethinyl estradiol and levonorgestrel (Triphasil), ethinyl estradiol and norethindrone (Ortho-Novum 1/35, Ortho-Novum 7/7/7), and others.

  • Cimetidine (Tagamet) interacts with GREEN TEA

    Green tea contains caffeine. The body breaks down caffeine to get rid of it. Cimetidine (Tagamet) can decrease how quickly your body breaks down caffeine. Taking cimetidine (Tagamet) along with green tea might increase the chance of caffeine side effects including jitteriness, headache, fast heartbeat, and others.

  • Clozapine (Clozaril) interacts with GREEN TEA

    The body breaks down clozapine (Clozaril) to get rid of it. The caffeine in green tea seems to decrease how quickly the body breaks down clozapine (Clozaril). Taking green tea along with clozapine (Clozaril) can increase the effects and side effects of clozapine (Clozaril).

  • Dipyridamole (Persantine) interacts with GREEN TEA

    Green tea contains caffeine. The caffeine in green tea might block the affects of dipyridamole (Persantine). Dipyridamole (Persantine) is often used by doctors to do a test on the heart. This test is called a cardiac stress test. Stop drinking green tea or other caffeine-containing products at least 24 hours before a cardiac stress test.

  • Disulfiram (Antabuse) interacts with GREEN TEA

    The body breaks down caffeine to get rid of it. Disulfiram (Antabuse) can decrease how quickly the body gets rid of caffeine. Taking green tea (which contains caffeine) along with disulfiram (Antabuse) might increase the effects and side effects of caffeine including jitteriness, hyperactivity, irritability, and others.

  • Estrogens interacts with GREEN TEA

    The body breaks down the caffeine in green tea to get rid of it. Estrogens can decrease how quickly the body breaks down caffeine. Taking estrogen pills and drinking green tea can cause jitteriness, headache, fast heartbeat, and other side effects. If you take estrogen pills limit your caffeine intake.<br /> Some estrogen pills include conjugated equine estrogens (Premarin), ethinyl estradiol, estradiol, and others.

  • Fluvoxamine (Luvox) interacts with GREEN TEA

    The body breaks down the caffeine in green tea to get rid of it. Fluvoxamine (Luvox) can decrease how quickly the body breaks down caffeine. Taking green tea along with fluvoxamine (Luvox) might cause too much caffeine in the body, and increase the effects and side effects of caffeine.

  • Lithium interacts with GREEN TEA

    Your body naturally gets rid of lithium. The caffeine in green tea can increase how quickly your body gets rid of lithium. If you take products that contain caffeine and you take lithium, stop taking caffeine products slowly. Stopping caffeine too quickly can increase the side effects of lithium.

  • Medications for depression (MAOIs) interacts with GREEN TEA

    The caffeine in green tea can stimulate the body. Some medications used for depression can also stimulate the body. Drinking green tea and taking some medications for depression might cause too much stimulation of the body and serious side effects including fast heartbeat, high blood pressure, nervousness, and others.<br /> Some of these medications used for depression include phenelzine (Nardil), tranylcypromine (Parnate), and others.

  • Medications that can harm the liver (Hepatotoxic drugs) interacts with GREEN TEA

    Green tea extracts might harm the liver. Taking green tea extracts along with medication that might also harm the liver can increase the risk of liver damage. Do not take green tea extracts if you are taking a medication that can harm the liver.<br /> Some medications that can harm the liver include acetaminophen (Tylenol and others), amiodarone (Cordarone), carbamazepine (Tegretol), isoniazid (INH), methotrexate (Rheumatrex), methyldopa (Aldomet), fluconazole (Diflucan), itraconazole (Sporanox), erythromycin (Erythrocin, Ilosone, others), phenytoin (Dilantin) , lovastatin (Mevacor), pravastatin (Pravachol), simvastatin (Zocor), and many others.

  • Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs) interacts with GREEN TEA

    Green tea might slow blood clotting. Taking green tea along with medications that also slow clotting might increase the chances of bruising and bleeding.<br /> Some medications that slow blood clotting include aspirin, clopidogrel (Plavix), diclofenac (Voltaren, Cataflam, others), ibuprofen (Advil, Motrin, others), naproxen (Anaprox, Naprosyn, others), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, warfarin (Coumadin), and others.

  • Nicotine interacts with GREEN TEA

    Stimulant drugs such as nicotine speed up the nervous system. By speeding up the nervous system, stimulant medications can make you feel jittery and increase your heart rate. The caffeine in green tea might also speed up the nervous system. Taking green tea along with stimulant drugs might cause serious problems including increased heart rate and high blood pressure. Avoid taking stimulant drugs along with caffeine.

  • Pentobarbital (Nembutal) interacts with GREEN TEA

    The stimulant effects of the caffeine in green tea can block the sleep-producing effects of pentobarbital.

  • Phenylpropanolamine interacts with GREEN TEA

    Green tea contains caffeine. Caffeine can stimulate the body. Phenylpropanolamine can also stimulate the body. Taking green tea and phenylpropanolamine together might cause too much stimulation and increase heartbeat, blood pressure and cause nervousness.

  • Riluzole (Rilutek) interacts with GREEN TEA

    The body breaks down riluzole (Rilutek) to get rid of it. Drinking green tea can decrease how quickly the body breaks down riluzole (Rilutek) and increase the effects and side effects of riluzole.

  • Theophylline interacts with GREEN TEA

    Green tea contains caffeine. Caffeine works similarly to theophylline. Caffeine can also decrease how quickly the body gets rid of theophylline. Taking green tea along with theophylline might increase the effects and side effects of theophylline.

  • Verapamil (Calan, Covera, Isoptin, Verelan) interacts with GREEN TEA

    The body breaks down the caffeine in green tea to get rid of it. Verapamil (Calan, Covera, Isoptin, Verelan) can decrease how quickly the body gets rid of caffeine. Drinking green tea and taking verapamil (Calan, Covera, Isoptin, Verelan) can increase the risk of side effects for caffeine including jitteriness, headache, and an increased heartbeat.

  • Warfarin (Coumadin) interacts with GREEN TEA

    Warfarin (Coumadin) is used to slow blood clotting. Large amounts of green tea have been reported to decrease the effectiveness of warfarin (Coumadin). Decreasing the effectiveness of warfarin (Coumadin) might increase the risk of clotting. It is unclear why this interaction might occur. Be sure to have your blood checked regularly. The dose of your warfarin (Coumadin) might need to be changed.

Minor Interaction

Be watchful with this combination

!
  • Alcohol interacts with GREEN TEA

    The body breaks down the caffeine in green tea to get rid of it. Alcohol can decrease how quickly the body breaks down caffeine. Taking green tea along with alcohol might cause too much caffeine in the bloodstream and caffeine side effects including jitteriness, headache, and fast heartbeat.

  • Fluconazole (Diflucan) interacts with GREEN TEA

    Green tea contains caffeine. The body breaks down caffeine to get rid of it. Fluconazole (Diflucan) might decrease how quickly the body gets rid of caffeine and cause caffeine to stay in the body too long. Taking fluconazole (Diflucan) along with green tea might increase the risk of side effects such as nervousness, anxiety, and insomnia.

  • Medications for diabetes (Antidiabetes drugs) interacts with GREEN TEA

    Green tea contains caffeine. Caffeine might increase blood sugar. Diabetes medications are used to lower blood sugar. Taking some medications for diabetes along with caffeine might decrease the effectiveness of diabetes medications. Monitor your blood sugar closely. The dose of your diabetes medication might need to be changed.<br /> Some medications used for diabetes include glimepiride (Amaryl), glyburide (DiaBeta, Glynase PresTab, Micronase), insulin, pioglitazone (Actos), rosiglitazone (Avandia), chlorpropamide (Diabinese), glipizide (Glucotrol), tolbutamide (Orinase), and others.

  • Mexiletine (Mexitil) interacts with GREEN TEA

    Green tea contains caffeine. The body breaks down caffeine to get rid of it. Mexiletine (Mexitil) can decrease how quickly the body breaks down caffeine. Taking Mexiletine (Mexitil) along with green tea might increase the caffeine effects and side effects of green tea.

  • Terbinafine (Lamisil) interacts with GREEN TEA

    The body breaks down the caffeine in green tea to get rid of it. Terbinafine (Lamisil) can decrease how fast the body gets rid of caffeine. Taking green tea along with terbinafine (Lamisil) can increase the risk of caffeine side effects including jitteriness, headache, increased heartbeat, and other effects.

Dosing

Dosing

The following doses have been studied in scientific research:

BY MOUTH:

  • For high cholesterol: Green tea or green tea extracts containing 150 to 2500 mg catechins, taken in single or 2 divided doses daily for up to 24 weeks, has been used.
  • For abnormal development of cells of the cervix (cervical dysplasia): 200 mg of green tea extract, taken by mouth daily along with a green tea ointment applied twice weekly for 8-12 weeks, has been used.
  • For high blood pressure: A green tea drink, made by boiling a 3 gram tea bag with 150 mL water, has been used three times daily about 2 hours after each meal for 4 weeks. Also, 379 mg of a specific product containing green tea extract (Olimp Labs, Debica, Poland), taken daily with the morning meal for 3 months, has been used.
  • For low blood pressure: 400 mL of green tea taken before lunch has been used.
  • For thick, white patches on the gums (oral leukoplakia): 3 grams of mixed green tea taken by mouth and applied to the skin for 6 months has been used.
APPLIED TO THE SKIN:
  • For genital warts: A specific green tea extract ointment (Veregen, Bradley Pharmaceuticals; Polyphenon E ointment 15%, MediGene AG) applied three times daily to warts for up to 16 weeks, has been used. This product is FDA-approved for treating this condition.
  • For abnormal development of cells of the cervix (cervical dysplasia): A green tea ointment has been used alone twice weekly, or in combination with 200 mg of green tea extract taken by mouth daily for 8-12 weeks.
  • For thick, white patches on the gums (oral leukoplakia): 3 grams of mixed green tea taken by mouth and applied to the skin for 6 months has been used.

View References

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  • Key, T. J., Sharp, G. B., Appleby, P. N., Beral, V., Goodman, M. T., Soda, M., and Mabuchi, K. Soya foods and breast cancer risk: a prospective study in Hiroshima and Nagasaki, Japan. Br J Cancer 1999;81(7):1248-1256. View abstract.
  • Kikuchi, N., Ohmori, K., Shimazu, T., Nakaya, N., Kuriyama, S., Nishino, Y., Tsubono, Y., and Tsuji, I. No association between green tea and prostate cancer risk in Japanese men: the Ohsaki Cohort Study. Br.J Cancer 8-7-2006;95(3):371-373. View abstract.
  • Kim, W., Jeong, M. H., Cho, S. H., Yun, J. H., Chae, H. J., Ahn, Y. K., Lee, M. C., Cheng, X., Kondo, T., Murohara, T., and Kang, J. C. Effect of green tea consumption on endothelial function and circulating endothelial progenitor cells in chronic smokers. Circ.J 2006;70(8):1052-1057. View abstract.
  • Kohler, M., Pavy, A., and van den Heuvel, C. The effects of chewing versus caffeine on alertness, cognitive performance and cardiac autonomic activity during sleep deprivation. J Sleep Res. 2006;15(4):358-368. View abstract.

More Resources for GREEN TEA

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