Pharmaceutical Name : Rhizoma Drynariae

Botanical Name: 1. Drynaria frotunei (Kunze) J. Sm.; 2. Drynaria baronii (Christ) Diels

Common Name: Drynaria, Davallia

Source of Earliest Record: Kaibao Bencao

Part Used & Method for Pharmaceutical Preparations: The rhizomes are dug in any season. After they have been cleaned, the rhizomes are cut into slices and dried.

Properties & Taste: Bitter and warm

Meridians: Liver and kidney

Functions:
1. To tonify the kidneys;
2. To invigorate blood and stop bleeding;
3. To heal wounds

Indications & Combinations:

1. Deficient kidneys manifested as lower back pain, weakness of the legs, tinnitus, deafness or toothache. Drynaria (Gusuibu) is used with Psoralea fruit (Buguzhi), Cyathula root (Niuxi) and Walnut seed (Hutaoren) for lower back pain and weakness of the legs. Drynaria (Gusuibu) can also be used with Prepared rehmannia root (Shudihuang) and Dogwood fruit (Shanzhuyu) for tinnitus, deafness and toothache.

2. Swelling and pain due to external trauma or injury. Drynaria (Gusuibu) is used with Tiger bone (Hugu), Tortoise plastron (Guiban) and Myrrh (Moyao).

Dosage: 10-20 g

Cautions & Contraindications: This herb is contraindicated in cases with deficiency of yin with internal heat and symptoms without blood stasis.