There is no clear time limit for the use of Keserol, but it is generally not advisable to use it frequently. The pharmacological effect of Keserol is the use of hypertonic effect, soften stool and stimulate the intestinal wall to cause reflex defecation response, and its lubricating effect, commonly used in the treatment of constipation and other diseases, the use of Keserol intervals in the instructions are not clearly stipulated. It is generally believed that Keserol should not be used frequently, because frequent stimulation will lead to a decrease in rectal sensitivity, long-term use will lead to drug-dependent constipation, which is not conducive to the health of patients. It should be noted that the product is prohibited for those who have changed its properties or are allergic to it. Kai Sei Nou should be used under the guidance of a physician, not blindly self-medication.