Black tea is used for improving mental alertness as well as learning, memory, and information processing skills. It is also used for conditions such as headache, both low and high blood pressure, preventing Parkinson disease, and many others, but there is no good scientific evidence to support these uses.
In foods, black tea is consumed as a hot or cold beverage.
How does it work ?
Uses & Effectiveness ?
Likely Effective for
- Mental alertness. Drinking black tea and other caffeinated beverages throughout the day helps to keep people alert, even after extended periods without sleep.
Possibly Effective for
- Low blood pressure. Black tea contains caffeine. Drinking beverages containing caffeine helps increase blood pressure in older people who have low blood pressure after eating.
- Heart attack. Some research shows that people who drink black tea have a lower risk of having a heart attack. Also, people who have been drinking black tea for at least a year before having a heart attack seem to be less likely to die after having a heart attack.
- Weak and brittle bones (osteoporosis). Early research suggests that older women who drink more black tea have stronger bones than those who drink less. Drinking more black tea also seems to be linked with a lower risk of hip fracture in older men and women.
- Ovarian cancer. Women who regularly drink tea, including black tea or green tea, appear to have a lower risk of developing ovarian cancer compared to women who never or rarely drink tea.
- Parkinson disease. Some research shows that people who drink caffeinated beverages such as coffee, tea, and cola have a lower risk of Parkinson disease. The lower risk seems to be directly related to the dose of caffeine in men but not women. Drinking black tea also appears to be linked with a reduced risk of Parkinson disease among people who smoke cigarettes.
Possibly Ineffective for
- Bladder cancer. People who drink tea, including black tea and green tea, do not seem to have a lower risk of bladder cancer compared to those who don't drink tea.
- Breast cancer. People who drink black tea do not seem to have a lower risk of breast cancer compared to those who don't drink black tea.
- Colon cancer, rectal cancer. Some early research suggests that drinking black or green tea might be linked with a lower risk of colon and rectal cancer. However, most research shows that drinking tea is not linked with a lower risk of colon and rectal cancer. In fact, some early research suggests that drinking higher amounts of black tea might be linked with an increased risk of colon and rectal cancer.
- Diabetes. Early research suggests that taking an extract of black and green tea does not improve average blood sugar levels in people with diabetes. Other early research suggests that drinking at least one cup of black tea per day is not linked with a lower risk of developing type 2 diabetes in Japanese adults.
- Cancer of the lining of the uterus (endometrial cancer). Women who drink more black tea do not seem to have a lower risk of developing endometrial cancer compared to those who drink less.
- Cancer of the esophagus. People who drink higher amounts of black tea do not seem to have a lower risk of developing cancer of the esophagus compared to those who drink less. In fact, some research suggests that drinking more or stronger black tea might increase the risk of cancer of the esophagus.
- Stomach cancer. Some early research suggests that drinking black or green tea might be linked with a lower risk of stomach cancer. However, most research shows that people who drink black or green tea do not have a lower risk of stomach cancer. In fact, some early research suggests that people who drinking higher amounts of black tea might have an increased risk of stomach cancer compared to those who drink less.
- Lung cancer. Early research found that drinking black tea is not linked with a reduced risk of lung cancer and may even be linked with an increased risk.
Insufficient Evidence for
- Hardening of the arteries (atherosclerosis). Early research suggests that people who drink black tea have a reduced risk of having their arteries become hardened compared to those who don't drink black tea. This link is stronger in women than men.
- Heart disease. Most research suggests that drinking black tea does not protect against heart disease or death from heart disease. But not all research agrees. Some research in people who already have heart disease suggests that drinking black tea is linked with a higher risk of heart disease becoming worse or causing death.
- Cavities. Early research suggests that rinsing with a black tea extract might help prevent cavities.
- Diarrhea. Early research shows that taking black tea as tablets reduces watery stool in children with diarrhea.
- High levels of cholesterol or other fats (lipids) in the blood (hyperlipidemia). It is still not clear if drinking black tea helps to reduce levels of cholesterol in the blood. Some research shows that black tea might reduce total cholesterol and low-density lipoprotein (LDL or "bad") cholesterol in people with normal or high cholesterol levels. However, other research shows that drinking black tea does not have these effects.
- High blood pressure. Some research shows that drinking 3-5 cups per day of black tea or taking black tea extract can reduce blood pressure by a very small amount in people with normal or high blood pressure. But not all research agrees. And the small reduction in blood pressure is probably not clinically meaningful.
- Kidney stones. Women who drink one cup of tea, such as black tea, per day seem to have a lower risk of developing kidney stones compared to those who don't drink tea.
- Obesity. Early research shows that taking a product containing black tea extract plus many other ingredients for 12 weeks does not reduce body weight in overweight adults.
- Pancreatic cancer. Some early research suggests that drinking black tea is linked with a reduced risk of pancreatic cancer. However, other research shows conflicting results.
- Prostate cancer. Early research suggests that drinking black tea is linked with a reduced risk of prostate cancer.
- Kidney cancer. Early research suggests that people who drink higher amounts of black or green tea have an increased risk of developing kidney cancer.
- Stress. Early research suggests that drinking black tea for 6 weeks does not improve blood pressure, heart rate, or feelings of stress ratings while performing stressful tasks.
- Stroke. Black tea contains chemicals called flavonoids. Early research suggests that eating a diet that contains flavonoids is linked with a lower risk of stroke.
- Stomach disorders.
- Increasing response to sexual stimuli.
- Other conditions.
Drinking too much black tea, such as more than five cups per day, is POSSIBLY UNSAFE. High amounts of black tea can cause side effects due to the caffeine in black tea. 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. Also, people who drink black tea or other caffeinated beverages all the time, especially in large amounts, can develop psychological dependence.
Drinking very high amounts of black tea containing more than 10 grams of caffeine is LIKELY UNSAFE. Doses of black tea this high might cause death or other severe side effects.
Special Precautions and Warnings
If you are breast-feeding, drinking more than 3 cups a day of black tea is POSSIBLY UNSAFE and might cause your baby to become more irritable and have more bowel movements.
Children: Black tea is POSSIBLY SAFE when taken by mouth by children in amounts commonly found in foods.
Anemia: Drinking black tea may make anemia worse in people with iron deficiency.
Anxiety disorders: The caffeine in black tea might make these conditions worse.
Bleeding disorders: There is some reason to believe that the caffeine in black tea might slow blood clotting, though this hasn't been shown in people. Use caffeine cautiously if you have a bleeding disorder.
Heart problems: Caffeine in black tea can cause irregular heartbeat in certain people. If you have a heart condition, use caffeine with caution.
Diabetes: The caffeine in black tea might affect blood sugar. Use black tea with caution if you have diabetes.
Diarrhea: Black tea contains caffeine. The caffeine in black tea, especially when taken in large amounts, might worsen diarrhea.
Seizures: Black tea contains caffeine. There is a concern that high doses of caffeine might cause seizures or decrease the effects of drugs used to prevent seizures. If you have ever had a seizure, don't use high doses of caffeine or caffeine-containing supplements such as black tea.
Glaucoma: Drinking caffeinated black tea increases the pressure inside the eye. The increase occurs within 30 minutes and lasts for at least 90 minutes.
Hormone-sensitive condition such as breast cancer, uterine cancer, ovarian cancer, endometriosis, or uterine fibroids: Black tea might act like estrogen. If you have any condition that might be made worse by exposure to estrogen, don't use black tea.
High blood pressure: The caffeine in black tea might increase blood pressure in people with high blood pressure. However, this doesn't seem to occur in people who regularly drink black tea or other caffeinated products.
Irritable bowel syndrome (IBS): Black tea contains caffeine. The caffeine in black tea, especially when taken in large amounts, might worsen diarrhea and might worsen symptoms of IBS.
Brittle bones (osteoporosis): Drinking caffeinated black tea can increase the amount of calcium that is flushed out in the urine. This might weaken bones. Don't drink more than 300 mg of caffeine per day (approximately 2-3 cups of black tea). Taking extra calcium may help to make up for calcium losses. Older women who have a genetic condition that affects the way they use vitamin D, should use caffeine with caution.
Adenosine (Adenocard) interacts with BLACK TEA
Black tea contains caffeine. The caffeine in black 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 drinking black tea or other caffeine-containing products at least 24 hours before a cardiac stress test.
Antibiotics (Quinolone antibiotics) interacts with BLACK 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 black tea can increase the risk of side effects including jitteriness, headache, increased heart rate, and other side effects.
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).
Cimetidine (Tagamet) interacts with BLACK TEA
Black 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 black tea might increase the chance of caffeine side effects including jitteriness, headache, fast heartbeat, and others.
Clozapine (Clozaril) interacts with BLACK TEA
The body breaks down clozapine (Clozaril) to get rid of it. The caffeine in black tea seems to decrease how quickly the body breaks down clozapine (Clozaril). Taking black tea along with clozapine (Clozaril) can increase the effects and side effects of clozapine (Clozaril).
Dipyridamole (Persantine) interacts with BLACK TEA
Black tea contains caffeine. The caffeine in black 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 black tea or other caffeine containing products at least 24 hours before a cardiac stress test.
Disulfiram (Antabuse) interacts with BLACK TEA
The body breaks down caffeine to get rid of it. Disulfiram (Antabuse) can decrease how quickly the body gets rid of caffeine. Taking black tea (which contains caffeine) along with disulfiram (Antabuse) might increase the effects and side effects of caffeine including jitteriness, hyperactivity, irritability, and others.
Ephedrine interacts with BLACK TEA
Stimulant drugs speed up the nervous system. Black tea contains caffeine. Caffeine and ephedrine are both stimulant drugs. Taking black 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.
Estrogens interacts with BLACK TEA
The body breaks down the caffeine in black tea to get rid of it. Estrogens can decrease how quickly the body breaks down caffeine. Taking estrogen pills and drinking black tea can cause jitteriness, headache, fast heartbeat, and other side effects. If you take estrogen pills limit your caffeine intake.
Some estrogen pills include conjugated equine estrogens (Premarin), ethinyl estradiol, estradiol, and others.
Fluvoxamine (Luvox) interacts with BLACK TEA
The body breaks down the caffeine in black tea to get rid of it. Fluvoxamine (Luvox) can decrease how quickly the body breaks down caffeine. Taking caffeine along with fluvoxamine (Luvox) might cause too much caffeine in the body, and increase the effects and side effects of caffeine.
Lithium interacts with BLACK TEA
Your body naturally gets rid of lithium. The caffeine in black 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 BLACK TEA
The caffeine in black tea can stimulate the body. Some medications used for depression can also stimulate the body. Drinking black 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.
Some of these medications used for depression include phenelzine (Nardil), tranylcypromine (Parnate), and others.
Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs) interacts with BLACK TEA
Black tea might slow blood clotting. Taking black tea along with medications that also slow clotting might increase the chances of bruising and bleeding.
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.
Phenylpropanolamine interacts with BLACK TEA
The caffeine in black tea can stimulate the body. Phenylpropanolamine can also stimulate the body. Taking caffeine and phenylpropanolamine together might cause too much stimulation and increase heartbeat, blood pressure, and cause nervousness.
Pentobarbital (Nembutal) interacts with BLACK TEA
The stimulant effects of the caffeine in black tea can block the sleep-producing effects of pentobarbital.
Riluzole (Rilutek) interacts with BLACK TEA
The body breaks down riluzole (Rilutek) to get rid of it. Drinking black tea can decrease how quickly the body breaks down riluzole (Rilutek) and increase the effects and side effects of riluzole.
Stimulant drugs interacts with BLACK TEA
Stimulant drugs speed up the nervous system. By speeding up the nervous system, stimulant medications can make you feel jittery and speed up your heartbeat. The caffeine in black tea can also speed up the nervous system. Drinking black tea along with stimulant drugs might cause serious problems including increased heart rate and high blood pressure. Avoid taking stimulant drugs along with black tea.
Some stimulant drugs include diethylpropion (Tenuate), epinephrine, phentermine (Ionamin), pseudoephedrine (Sudafed), and many others.
Theophylline interacts with BLACK TEA
Black tea contains caffeine. Caffeine works similarly to theophylline. Caffeine can also decrease how quickly the body gets rid of theophylline. This might cause increased effects and side effects of theophylline.
Verapamil (Calan, Covera, Isoptin, Verelan) interacts with BLACK TEA
The body breaks down the caffeine in black tea to get rid of it. Verapamil (Calan, Covera, Isoptin, Verelan) can decrease how quickly the body gets rid of caffeine. Drinking black 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 BLACK TEA
Warfarin (Coumadin) is used to slow blood clotting. Large amounts of black tea might decrease how well warfarin (Coumadin) slows blood clotting. Decreasing the how well warfarin (Coumadin) slows blood clotting 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.
Be cautious with this combination
Alcohol interacts with BLACK TEA
The body breaks down the caffeine in black tea to get rid of it. Alcohol can decrease how quickly the body breaks down caffeine. Taking black tea along with alcohol might cause too much caffeine in the bloodstream and caffeine side effects including jitteriness, headache, and fast heartbeat.
Birth control pills (Contraceptive drugs) interacts with BLACK TEA
The body breaks down the caffeine in black tea to get rid of it. Birth control pills can decrease how quickly the body breaks down caffeine. Taking black tea along with birth control pills can cause jitteriness, headache, fast heartbeat, and other side effects.
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.
Fluconazole (Diflucan) interacts with BLACK TEA
Black 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. This could cause caffeine to stay in to body too long and increase the risk of side effects such as nervousness, anxiety, and insomnia.
Medications for depression (Tricyclic Antidepressants) interacts with BLACK TEA
Coffee contains chemicals called tannins. Tannins can bind to many medications and decrease how much medicine the body absorbs. To avoid this interaction avoid coffee 1 hour before and 2 hours after taking medications for depression called tricyclic antidepressants.
Some medications for depression include amitriptyline (Elavil) or imipramine (Tofranil, Janimine).
Medications for diabetes (Antidiabetes drugs) interacts with BLACK TEA
Black tea might increase blood sugar. Diabetes medications are used to lower blood sugar. By increasing blood sugar, black tea might decrease the effectiveness of diabetes medications. Monitor your blood sugar closely. The dose of your diabetes medication might need to be changed.
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 BLACK TEA
Black 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 black tea might increase the caffeine effects and side effects of black tea.
Phenothiazines interacts with BLACK TEA
Black tea contains chemicals called tannins. Tannins can bind to many medications and decrease how much medicine the body absorbs. To avoid this interaction avoid coffee 1 hour before and 2 hours after taking phenothiazine medications.
Some phenothiazine medications include fluphenazine (Permitil, Prolixin), chlorpromazine (Thorazine), haloperidol (Haldol), prochlorperazine (Compazine), thioridazine (Mellaril), and trifluoperazine (Stelazine).
Terbinafine (Lamisil) interacts with BLACK TEA
The body breaks down the caffeine in black tea to get rid of it. Terbinafine (Lamisil) can decrease how quickly the body gets rid of caffeine and increase the risk of side effects including jitteriness, headache, increased heartbeat, and other effects.
Be watchful with this combination
The following doses have been studied in scientific research:
- For mental alertness: 1-3 cups of black tea containing 30-100 mg of caffeine.
- For heart attack: At least 1 cup per day.
- For ovarian cancer: At least 2 cups per day.
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