2, life common tea, such as black tea, green tea, black tea and so on basically contain tannins, also known as tea polyphenols, formally because of this substance, will make the ferrous sulfate tablets, flavonoids and other medicines to generate precipitation, affecting the efficacy of the play, caffeine, theophylline and other ingredients will make the sedative drug efficacy weakened or disappeared, Dendrobium is commonly used in the health care, but also can be used as a drug, if and tea Taken together, it is likely to reduce the edible and medicinal health care value of dendrobium.