Published: Mar. 28, 2007
Updated: Aug. 22, 2011
Constipation -- infrequent, small, hard bowel movements -- is a common problem. Some of the reasons why constipation occurs are decreased activity level, decreased food and liquid intake, and use of narcotic pain medicines.
Normally, the small bowel absorbs nutrients from food as it is digested. The liquid stool then passes into the large bowel where fluids are absorbed to maintain the body's fluid balance.
The movement of food through the system is slowed down by decreased eating and drinking, decreased activity, and pain-relieving drugs, especially narcotics. This allows more water to be absorbed out of the stool and results in hard stool that is more difficult to pass out of the body.
Call your health care provider right away if you have any of the following:
Check with your health care provider before taking any laxatives, suppositories or enemas. If your blood counts are low, you should not use suppositories or enemas.
| Trade Name | Generic Name | Usual Dose | Comments |
|---|---|---|---|
| Senakot® Senakot-S® (Can be obtained without a prescription) |
Senna | 1-2 tablets up to 4 times a day | Mild laxative that stimulates the bowel. Senakot-S combines a laxative and stool softener. Works in 6-24 hours. |
| Milk of Magnesia® (Can be obtained without a prescription) |
Magnesium Hydroxide | 2-4 tablespoons or 2-4 tablets daily | Pulls fluid into the bowel movement to soften the stool and stimulate the bowel. Works in 6-12 hours. |
| Dulcolax® Correctol® (Can be obtained without a prescription) |
Biscadyl | 2-3 tablets daily | Stimulates the bowel more forcefully than senna. Works in 6-8 hours. May cause cramping. |
| Generlac® Enulose® Duphalac® (Requires a prescription) |
Lactulose | 1-2 tablespoonfuls daily | Draws fluid into the bowel to soften it. Take with water or juice to dilute sweet taste. Take on an empty stomach for more rapid action. |
| Miralax® (Requires a prescription) |
Polyethylene Glycol | 1 heaping tablespoon daily mixed with water or juice | Binds water in the bowel softening the stool. May take 2-4 days to see results. |
| Colace® (Can be obtained without a prescription) |
Docusate sodium | 1-2 capsules once or twice a day | Stool softener without a laxative. |
This article is intended as a resource for patients receiving their cancer care at Duke University Hospital or Duke Clinic. It is not intended to substitute for medical advice from your health care team. If your doctor’s instructions differ from the information in this article, please talk with your doctor before making any changes.
11/05
