Usually there are no medications that can be used for bowel movements as soon as you drink them. If the symptoms of constipation later, you can follow the doctor’s instructions wheat fiber, lactulose, polyethylene glycol and other drugs for defecation treatment. Due to congenital megacolon, inflammatory bowel disease, cerebral infarction, functional constipation and other factors, the symptoms of dry and hard feces and difficulty in defecation can occur. Generally you can choose the laxative drugs under the guidance of the doctor for treatment, but the drugs need a certain amount of time after use before they can be effective, so there is no drug that can defecate as soon as you drink it. Common drugs to promote defecation are mainly volumetric laxatives, such as wheat cellulose, after the use of fecal volume can be increased, retaining water in the feces, and can mildly promote intestinal peristalsis. You can also choose osmotic laxatives, such as lactulose and polyethylene glycol, which form a hypertonic state in the intestinal tract, adsorb water, and increase the volume of feces, thus making it easier to pass stools. If the symptoms of difficult bowel movements occur, it is recommended to consult a doctor in a timely manner, improve the examination to clarify the cause of the disease, and need to be in the doctor’s comprehensive assessment of the condition of the corresponding choice of medication for treatment, remember not to take medication on their own.