Lactulose oral solution will cause a bowel movement after about 24 hours of taking it. The main component of the solution is lactulose, a substance that is not absorbed by the body and at the same time maintains the pH of the intestine, preventing the absorption of toxins in the intestinal system. After taking lactulose oral solution, the amount of stool will increase in about 24 hours and at the same time stimulate the receptors of the intestinal tract, producing a bowel movement, but some people have a more serious degree of constipation, so it takes a longer time to produce a bowel movement after taking the drug. Once you take lactulose oral solution and still have no obvious effect for 48 hours, you can increase the dose of the drug appropriately, but avoid increasing the dose excessively to avoid the phenomenon of diarrhea, and you should also pay attention to drink more water and massage the abdomen clockwise when taking lactulose oral solution to improve the effect of the drug.