The laxatives that work immediately are mannitol, fruit-directed tablets, and open-loop, as follows: 1. Mannitol can be used not only as an intestinal cleanser, but also to improve constipation, and the effect is relatively fast. Mannitol needs to pay attention to drinking more water while taking it, which can increase the cleansing effect. The dose can also be increased for people with severe constipation.2. Fruit guide tablets, also known as phenolphthalein tablets, are mainly used to treat stubborn constipation. It is a good idea to take it to inhibit the absorption of fecal water in the intestines and also stimulate the peristalsis of the intestines, so it can quickly relieve constipation; 3. The effect of corkage is particularly obvious in relieving constipation and does not come with side effects. When using Cesarean is directly through the rectum, so the drug can directly contact the rectum inside, to avoid the side effects caused by the process of oral medication on the human body. After 15 minutes or so of using the corkage, intestinal peristalsis will increase and constipation will be improved.