The back shell of the animal Trionyx sinensis Wiegmann of family Trionychidae.
Nourish yin of liver and kidney, subdue yang, abate deficiency heat, soften hardness and dissipate nodulation.
Decoct 10~15 g. To raw material, be broken and decocted firstly. After stir-baked with gravel sand and dipped into vinegar, it is convenient to make pharmacological preparation because its effective ingredients are easy to be decocted out and get rid of smell of fish. Raw materials used for nourishing yin and subduing yang, stir-baked with vinegar for softening hardness and dissipating nodulation.