Sour jujube seed may cause skin allergies, itching and other discomforts; it is not suitable for patients with external symptoms (mainly manifested as respiratory symptoms after feeling external evils) or patients with incomplete symptoms. Sour jujube kernel is the dried mature seeds of sour jujube, family Rhamnaceae. It is sweet and sour in flavor and flat in nature. It belongs to the liver, gallbladder and heart meridians. It has the effect of nourishing the heart and tonifying the liver, tranquilizing the heart and tranquilizing the mind, restraining sweating and generating fluids. It is used in treating insomnia, palpitations and dreaming, sweating and thirst. Sour Jujube Seed is sweet, slow and tonic, good for treating insomnia caused by deficiency of the heart, liver and blood, and loss of nourishment of the spirit. Any insomnia caused by phlegm, food stagnation of solid evil or liver depression and fire (liver qi is impassable leading to the production of fire and heat) should not be taken in large quantities internally; it should not be taken by those who have external symptoms or those whose symptoms are not yet completed; sour jujube nut is moist and slippery in quality, and should not be taken in large quantities by those who have slippery and diarrheal stools. It is recommended that patients use the drug under the guidance of a doctor.