Lactulose solution is a natural laxative and works by softening stools and promoting their movement through the bowel constipation can affect almost everyone at one time or another and is caused by a number of things including a change in diet lack of exercise ignoring the urge to have a bowel movement as well as some medications and diseases without treatment for too long it can become serious take lactulose solution as well as increasing your fibre intake drinking plenty of fluids and e