【Nature and flavor】Bitter, warm. Enters the kidney and liver meridians.
 [Functions and indications] Tonify the kidney and strengthen bones, heal injuries and relieve pain. Used for low back pain due to kidney deficiency, tinnitus and deafness, loose teeth, falls, sprains, tendon fractures and injuries; external treatment of alopecia areata and vitiligo.
 【Usage and Dosage】 3-9g; fresh product 6-15g. For external use, fresh product should be used in appropriate amount.
 【Medical records】
 "Materia Medica": It is used to treat poisonous gas in bones, pain caused by wind and blood, fatigue, inability to close the mouth and hands, heat on the upper body and cold on the lower body.
 "Bencao Gangmu" (Bencao Gangmu): Treats malignant sores, rotten flesh, and kills insects.
 "Kaibao Materia Medica": It is used to break up blood, stop bleeding, and mend injuries and fractures.
 "Bencao Zheng": It is used to treat evil poison in the bones, wind-heat pain, or exogenous rheumatism, which causes weakness and pain in the feet.
 "Ben Cao Shu": Treats low back pain, arthralgia, stroke, rheumatoid arthritis, cramps, diarrhea, stranguria, spermatorrhea, and rectal prolapse.
 "Guangxi Chinese Materia Medica": Treats infantile malnutrition.
 "Sichuan Traditional Chinese Medicine Records": dissipates dampness and regulates menstruation.
 【Predecessors release medicine】
 "Compendium of Materia Medica": Drynaria can enter the bones to treat teeth and chronic diarrhea . In the past, Wei had chronic diarrhea and all doctors were ineffective. He was on the verge of death. I used this medicine, put it into pig kidneys and stewed it and ate it, and it stopped. The kidney controls urination and defecation. Chronic diarrhea is due to kidney deficiency, and it cannot be treated exclusively from the spleen and stomach. "Leigong Paozhi Lun" uses this recipe to treat tinnitus, and the ear is also the orifice of the kidney. According to Dai Yuanli's "Zhengzhi Yaojue", after diarrhea, the lower body is weak, not well-regulated, or travel far, or sexual fatigue, or external infection, resulting in paralysis of both feet, or pain or numbness, and then dysentery. It is appropriate to use Duhuo Jisheng Decoction, swallow four pounds of tiger bone pills, and grind one-third of Drynaria together, take the juice, and drink it with wine. Externally, use Dunixiexi, Shanmujie, Dihuangxie , Baizhi, and Nanxing decoction frequently for fumigation and washing. This is also a treatment for kidney deficiency and bone paralysis.
 "Ben Jing Xu Shu": Drynaria (Kai Bao Ben Cao) is used to break up blood, stop bleeding, and mend injuries and fractures. It is said that it can prevent blood stasis from stagnating and flow, and can mend injuries and fractures as if they were not injured at all.