The correct formula name of Clam Dai San should be Dai Clam San, and its dosage is usually three qian per post, i.e., 9g, and the dosage should be judged by the physician according to the condition. Dai Clam San is mainly composed of two Chinese herbs, Qing Dai and Clam Shell, which are crushed into fine powder, sieved and mixed together, which mainly has the effect of clearing the liver and resolving phlegm, and can be used for the treatment of cough due to liver fire in the lungs, burning the fluid into phlegm, phlegm of yellowish consistency or yellowish-white color, pain in the chest and ribs, irritability, etc. The formula can be taken directly by mouth, and can also be taken with the prescription of 9g per post. Dai Clam San can be used directly orally, can also be used with the prescription into the decoction, but the lung and kidney yin deficiency and spleen deficiency loose stools (feces thin and not shaped) should be used with caution, the specific use of the physician’s guidance, is not recommended to blindly take on their own.