Lactulose is a synthetic sugar used to treat constipation [1]. It works by drawing water into the colon, which softens the stool and makes it easier to pass [1].
How does lactulose work for constipation?
Lactulose is a non-absorbable osmotic laxative [1]. When ingested, it passes through the digestive system largely undigested until it reaches the colon. There, it draws water from the surrounding tissues into the intestinal lumen through osmosis. This increased water content softens the stool and increases its volume, stimulating peristalsis, the wave-like muscle contractions that move waste through the intestines [1]. Lactulose is also fermented by colonic bacteria, which produces short-chain fatty acids that can further stimulate bowel activity [1].
How long does it take for lactulose to relieve constipation?
The effects of lactulose are typically seen within 24 to 48 hours of taking a dose [1].
What are the common side effects of lactulose?
Commonly reported side effects of lactulose include abdominal discomfort, bloating, gas, and diarrhea [1]. These effects are often dose-dependent and may lessen as the body adjusts to the medication.
Can lactulose be used long-term?
Lactulose can be used for chronic constipation, but it is advisable to consult a healthcare professional for long-term management [1].
Is lactulose available over-the-counter?
Yes, lactulose is available over-the-counter in various formulations, including liquid solutions [1].
What is the typical dosage of lactulose for constipation?
Dosages for lactulose vary based on age and the severity of constipation. For adults, a common starting dose is 15 to 30 mL once or twice daily, which may be adjusted based on response [1]. It is important to follow the dosage instructions provided by a healthcare provider or on the product packaging.
What is the difference between lactulose and other laxatives?
Lactulose is an osmotic laxative, meaning it works by drawing water into the bowel. Other types of laxatives include stimulant laxatives (which trigger bowel muscle contractions), bulk-forming laxatives (which add fiber to stool), and stool softeners (which allow water to penetrate stool). Lactulose is generally considered gentler than stimulant laxatives and can be effective for chronic constipation [1].
Are there any drug interactions with lactulose?
Lactulose may interact with other medications, particularly other laxatives. It is important to inform a healthcare provider about all medications, supplements, and herbal products being taken before starting lactulose [1].