Rush root has the effect of clearing away heat and promoting the production of fluids, removing vexation and stopping vomiting, diuretic, used for fever and feverish disease of vexation, thirst, and stomach heat and vomiting symptoms. It can also be used to treat lung-heat coughs and coughing up pus and phlegm when the lungs are congested. Rehmannia has antipyretic and laxative properties and is used for urinary tract infections. It can be used in decoctions, and is often combined with maitong and smallpox pollen to clear away heat and promote the production of fluids, and with loquat leaves to clear away heat and stop vomiting.