The efficacy of cinnamon and yellow dock in water is to replenish fire and help Yang, clear heat and dry dampness. However, cinnamon and rhubarb in water is limited in the amount of active ingredients analyzed, and can not be used as a substitute for medication. Cinnamon has the effect of tonifying fire and helping Yang, dispersing cold and relieving pain, and promoting blood circulation and menstruation. Used for kidney yang deficiency, impotence, cold uterus, dizziness, cold pain in the heart and abdomen, menstrual dysmenorrhea, yin gangrene (is a class of slow condition of yin sores and ulcers of the disease of the general term) flow injection (hair in the muscle deep multiple abscesses) and so on. It is not recommended for people with yin deficiency and fire exuberance, and should be used with caution for people with bleeding tendency. Use with caution in pregnant women. It should not be used together with red stone resin. Huang Lian (Rhizoma Coptidis) has the effects of clearing heat and drying dampness, diarrhea and detoxification. It is used for treating damp-heat plumpness (stomach distension and discomfort), vomiting and acid swallowing (swallowing the acid in the stomach that rushes up to the mouth and throat), damp-heat diarrhea (diarrhea caused by feeling damp-heat evil), and disturbed heart and sleeplessness (disturbed heat in the heart (irritability and sultriness), insomnia). Do not use if the spleen and stomach are cold. Caution is advised for those with Yin deficiency and fluid injury. If there is any discomfort after drinking Cinnamon Rhizoma Coptidis in water, it is recommended to stop using it and consult a doctor promptly.