The efficacy of lotus seed heart in water is to clear the heart and tranquilize the mind (to stabilize the mind by getting rid of the inner heat), to transport the heart and kidneys (the fire in the heart goes down and the water in the kidneys goes up, which is in mutual control), and to astringe the essence and stop bleeding. Lotus heart is bitter and cold in nature, easily injuring the spleen and stomach, so it is forbidden for people with cold spleen and stomach (weak and cold spleen and stomach). Lotus seed heart is bitter in taste and cold in nature. It belongs to the heart and kidney meridians. Clinically, it is mainly used for heat into the pericardium (heat evils invade the pericardium), delirium tremens (confusion, nonsense), heart and kidney dysfunction (heart fire, kidney yin deficiency, dysfunction of the physiological functions of the heart and kidneys), insomnia and spermatorrhea, and hematemesis and vomiting of blood. However, the effective dosage of Lotus heart in water is limited and it is difficult to achieve the above effects, it is recommended to take under the guidance of a doctor.