Laxatives in this group include milk of magnesia, citrate of magnesia, lactulose, and Epsom salts. Summary The frequency of bowel movements among healthy people varies from three movements a day to three a week. Individuals must determine what is normal. As a rule, constipation should be suspected if more than 3 days pass between bowel movements or if there is difficulty or pain when passing a hardened stool. Most people experience occasional short bouts of constipation, but if a laxative is necessary for longer than 3 weeks, check with a doctor.
Doctors agree that prevention is the best approach to constipation.
Know what is normal and do not rely unnecessarily on laxatives. Drink plenty of fluids. Set aside time after breakfast or dinner for undisturbed visits to the toilet. Don't ignore the urge to defecate. Whenever there is a significant or prolonged change in bowel habits, check with a doctor.