How long it takes to have a bowel movement after drinking liquid paraffin depends on the dosage taken and the individual’s condition, usually 1-4 hours to have a bowel movement. Medical liquid paraffin is mainly used for the treatment of constipation, because liquid paraffin is not easy to digest in the intestines, less absorption, has the effect of lubrication of the intestines and feces, but also prevents the intestines from absorbing water, soften stools, and facilitate the discharge of stools. Body physique is better, intestinal peristalsis ability is strong, generally about 1 hour will defecate; physique is weaker patients with poor gastrointestinal peristalsis ability, it may take 3 to 4 hours to defecate. In order to completely change the constipation, first of all, we should go to the hospital to do the necessary medical examination to rule out the lesions, usually do more exercise, abdominal massage, etc., to develop good eating habits and bowel habits.