What is a laxative?
A laxative is a substance that helps you have a bowel movement. Laxatives are used to relieve and prevent constipation, which occurs when it is difficult to have a bowel movement.
What types of laxatives are there?
There are four types of products for preventing or treating constipation:
- Bulking agents. Food such as bran or products such as Metamucil, Fibercon, or Prodiem ease constipation by absorbing more fluid in the intestines. This makes the stool bigger, which gives you the urge to pass the stool. Regular use of bulking agents is safe and often lets you have more stools.
- Stool softeners. Products such as Colace lubricate and soften the stool in the intestine, making it easier to pass. Stool softeners do not often cause problems but they don't work as well if you don't drink enough water during the day.
- Osmotic laxatives. Products such as Fleet Phospho-Soda, Milk of Magnesia, or RestoraLAX and non-absorbable sugars such as lactulose or sorbitol hold fluids in the intestine and draw fluids into the intestine from other tissue and blood vessels. This extra fluid in the intestines makes the stool softer and easier to pass. Drink plenty of water when you use this type of laxative.
- Stimulant laxatives. Products such as Correctol, Dulcolax, Ex-Lax, or Senokot speed up how fast a stool moves through the intestines by irritating the lining of the intestines. Regular use of stimulant laxatives is not recommended. Stimulant laxatives change the tone and feeling in the large intestine and you can become dependent on using laxatives all the time to have a bowel movement.
Are there precautions for taking laxatives?
- Take any laxative or bulking agent with plenty of water or other liquids.
- Do not take stimulant laxatives regularly. Stimulant laxatives change the tone and feeling in the large intestine and you can become dependent on using laxatives all the time to have a bowel movement. If you need help having regular bowel movements, use a bulking agent, such as bran or psyllium (for example, Metamucil).
- Regular use of stimulant laxatives—such as Correctol, Dulcolax, Ex-Lax, or Senokot—may change your body's ability to absorb of vitamin D and calcium. This can cause weakening of your bones (osteopenia).
Are there other ways to treat constipation?
There are many other ways to treat constipation, such as drinking more water or adding more fibre, fruits, and vegetables to your diet. These are often recommended in addition to taking laxatives.
Current as of: August 12, 2019
Author: Healthwise Staff
William H. Blahd Jr. MD, FACEP - Emergency Medicine
Adam Husney MD - Family Medicine
Kathleen Romito MD - Family Medicine
David Messenger MD
E. Gregory Thompson MD - Internal Medicine