Type of medicine: natural remedy
Scientific and common names: Camellia sinensis, Thea bohea, Thea sinensis, Thea viridis, green tea, Chinese tea, Japanese tea
Green tea comes from a large shrub with evergreen leaves. The shrub is native to eastern Asia. It has leathery, dark green leaves and fragrant, white flowers. The dried, cured leaves have been used to prepare brewed drinks for more than 4000 years.
Green tea and black tea come from the same plant, but green tea leaves are not fermented Green tea has many of the same chemicals as the fresh leaf.
This remedy has been used to treat several conditions. Studies in humans or animals have not proved that this remedy is safe or effective for all uses. Before using this remedy for a serious condition, you should talk with your healthcare provider. There may be other uses that are not listed below.
Green tea has been taken by mouth to:
Green tea bags have been used on the skin to soothe sunburn and prevent skin damage, as a compress for headache or tired eyes, and to stop the bleeding of tooth sockets.
The US Food and Drug Administration (FDA) does not approve uses for natural remedies. The FDA does not inspect or regulate natural remedies the way they do prescription medicines.
Most green tea products can be prepared as a tea for drinking. Tablets, capsules, and liquid forms are also available. Follow the directions printed on the product label.
Symptoms of an acute overdose have not been reported.
Talk with your healthcare provider before taking this remedy if you have:
Do not drink a lot of coffee, or cola while you are taking this remedy. These drinks also contain caffeine, and the combination may overstimulate you and cause side effects. Also check the labels of all nonprescription and prescription medicines you take. Other medicines that contain caffeine may also cause problems. Ask your healthcare provider or pharmacist if you have any questions.
If you feel dizzy or have a fast heartbeat, stop taking the green tea. If the dizziness or fast heartbeat continues, contact your healthcare provider.
If you need emergency care, surgery, or dental work, tell the healthcare provider or dentist you are taking this medicine.
Talk to your healthcare provider or pharmacist about any natural remedy that you are using or thinking about using. If your provider does not tell you how to take it, follow the directions that come with the package. Do not take more or take it longer than recommended. Ask about anything you do not understand. Remember:
Along with its desirable effects, this remedy may cause some unwanted side effects. Some side effects may be very serious. Some side effects may go away as your body adjusts to the remedy. Tell your healthcare provider if you have any side effects that continue or get worse.
Life-threatening (Report these to your healthcare provider right away). If you cannot reach your healthcare provider right away, get emergency medical care or call 911 for help): Allergic reaction (hives; itching; rash; trouble breathing; chest pain or tightness in your chest; swelling of your lips, tongue, and throat).
Side effects may include trouble breathing, nausea, vomiting, heartburn, stomach irritation, loss of appetite, diarrhea, or constipation.
Green tea has caffeine in it, which could cause side effects such as:
When you take this remedy with other medicines, it can change the way the remedy or the medicines work. Vitamins and certain foods may also interact. Using these products together might cause harmful side effects. Before taking this remedy, talk to your healthcare provider if you are taking:
If you are not sure if your medicines might interact, ask your pharmacist or healthcare provider. Keep a list of all your medicines with you. List all the prescription medicines, nonprescription medicines, supplements, natural remedies, and vitamins that you take. Be sure that you tell all healthcare providers who treat you about all the products you are taking.
Keep all natural remedies and medicines out of the reach of children.
This advisory includes select information only. The information was obtained from scientific journals, study reports, and other documents. The author and publisher make no warranty, expressed or implied, as to the information. The advisory may not include all side effects associated with a remedy or interactions with other medicines. Nothing herein shall constitute a recommendation for the use of any remedy. Ask your healthcare provider or pharmacist for more information.