Impaired glucose tolerance is usually not recommended to take pCms. Impaired glucose tolerance is a state between normoglycemia and diabetes, sometimes called pre-diabetes. At this point, the diagnostic criteria for diabetes have not yet been met, so it is not recommended to take either herbal medicines, proprietary Chinese medicines, or Western medicines directly. In this case, further evaluation of pancreatic islet function and the patient’s overall condition is generally required. For the few patients with insulin resistance can choose some western medicines to intervene. In contrast, proprietary Chinese medicines have not been found to have a direct protective or preventive effect on impaired glucose tolerance in developing diabetes mellitus. In the stage of impaired glucose tolerance, it can be regulated by changing lifestyle habits such as adjusting dietary structure, proper exercise and quitting smoking to improve the state of impaired glucose tolerance.