According to the different symptoms of the disease, the dosage is also different, the conventional use of decoction for use, the conventional dosage of 5 ~ 10g, the specific use, the dosage should be determined by the doctor of traditional Chinese medicine depending on the situation. Dilong, with salty taste and cold nature, belongs to spleen, liver, bladder meridian, has the effect of calming asthma, clearing collaterals, clearing away heat and frightening, and diuretic, and it is mostly used in the clinic for convulsions, seizures, epilepsy, high fever and dizziness, paralytic pain in joints, hemiplegia (one side of the limbs can not be freely moved), numbness of the limbs, lung fever, wheezing and coughing, oedema and urinary and other diseases. Di Long is usually decocted with a dosage of 5-10g and used externally in moderation. This product is salty and cold, easy to hurt the spleen and stomach, so it is used with caution for people with cold spleen and stomach. The adverse effects of this product are not clear. The specific dosage of the drug needs to be determined by a Chinese medicine practitioner according to the evidence of the disease, and should not be blindly added or subtracted on one’s own.