After drinking tea usually after thirty minutes before you can take medicine, remember that tea can not be taken at the same time as medicine. Because of the following three points: first, tea in the tea polyphenols will neutralize certain drugs, especially certain components of Chinese medicine such as Gehua, honeysuckle, Astragalus, Salvia, safflower, American ginseng, etc., will be neutralized by the tea polyphenols off the active ingredients, so it will make the effectiveness of the drug significantly reduced. Second, the tannic acid in tea will interact with iron, and prevent the absorption of ferrous sulfate, which is usually red source of anemia treatment, can not be taken at the same time as tea. Third, such as drinking tea immediately after taking medicine, will aggravate the abdominal distension, abdominal pain, diarrhea, constipation, nausea and other adverse drug reactions.