5-10 pcs. Dragon louse is an insect of the genus Dragon Louse in the family of Coleoptera, also known as diving beetle, flavor dragon and water turtle. Dragon louse is cold in nature, sweet in taste, belongs to the bladder meridian, has the effect of nourishing yin and tonifying the kidney, shrinking urine, activating blood and strengthening tendons. It is mainly used for treating pediatric enuresis, frequent urination in the elderly, and brown spots on the face. Adults should take 10 pcs per dose and children should take 5 pcs per dose. Because the body tolerance of small children is lower than that of adults, half of them can be taken.