Drugs which are principally used to improve appetite and digestion and remove food stagnation are known as drugs for improving appetite and digestion and removing food stagnation or digestives. Drugs of this class can remove stagnated food and restore the normal functions of the spleen and stomach in transporting and distributing nutrients. They are indiated for abdominal distension, belching, acid regurgitation, nausea, vomiting, and irregular bowel movements due to indigestion and food retention. They are also effective for indigestion due to the weakness of the spleen and stomach. These drugs are often used along with drugs for promoting circulation of qi so as to improve digestion of food. They are also given, according to the actual conditions of the patient in cooperation with interior-warming drugs, purgatives, or drugs for resolving dampness. In cases of indigestion due to deficiency of the spleen, drugs for regulating and reinforcing the spleen and stomach should be given as the principal remedies with the drugs for improving digestion and removing stagnation as subsidiary ones.