Tests are sometimes done to check the function of the muscles around the back passage. If you suddenly become constipated for no reason, you should see your doctor promptly. Constipation is usually improved by a proper diet, and drugs are therefore not needed. Occasional use of a suitable laxative is harmless, but regular use may make you dependent on it. Stimulant laxatives, such as senna and cascara, cause changes in the colon if used regularly for many years but can be useful every now and then for a short time.
Laxatives cause gripey abdominal pains if used in large doses.
A few people will need to take laxatives regularly, but this should only be done on your doctor's advice. The above preparations should always be taken with plenty of water. Stimulant laxatives - Bisacodyl, Senna. The stool is then softened. Lactulose, lactitol or sorbitol-sugars which humans can't digest.