You should not drink tea when taking cold medicine. Because most of the cold medicine is Chinese medicine group or Chinese medicine, western medicine compound preparation, which contains different Chinese medicine as well as western medicine, tea contains a lot of catecholamines, theophylline and a lot of vitamin C, etc.. These ingredients react with certain drug components in cold medicine, such as caffeine, paracetamol, acetaminophen, amantadine, etc., which may aggravate the side effects of the drug, or even antagonistic reactions with the drug. Not only affect the effect of the drug and reduce the efficacy, but also excessive intake will be metabolized through the liver and kidneys, thus increasing the burden on the liver and kidneys. Therefore, you can drink plain water or mineral water when taking cold medicine, do not drink tea.