Enulose is a prescription laxative used to treat two conditions: chronic constipation and hepatic encephalopathy, a brain condition caused by severe liver disease. It is a brand name for lactulose, a synthetic sugar that works in the large intestine to soften stool and help the body clear toxic ammonia.
Treating Chronic Constipation
Enulose’s most common use is relieving chronic constipation that hasn’t responded well to dietary changes or over-the-counter options. It works as an osmotic laxative, meaning it draws water into the bowel to soften stool and stimulate movement. Unlike many laxatives, your body doesn’t actually absorb Enulose. The small intestine lacks the enzymes to break it down, so it passes intact to the large intestine, where gut bacteria ferment it. That fermentation produces gas and fatty acids that increase the water content and volume of stool, making it easier to pass.
For constipation, the typical starting dose is 15 to 30 mL (about 1 to 2 tablespoons) per day, which can be increased to 60 mL daily if needed. Results aren’t immediate. Improvement may occur within 24 hours, but for some people it takes 48 hours or longer before the first bowel movement. This slower onset is normal and doesn’t mean the medication isn’t working.
Managing Hepatic Encephalopathy
Enulose’s second major use is treating or preventing hepatic encephalopathy, sometimes called portal-systemic encephalopathy. This is a condition where a damaged liver can no longer filter ammonia from the blood effectively. Ammonia builds up, crosses into the brain, and causes symptoms ranging from mild confusion and personality changes to severe disorientation, slurred speech, and even coma.
Enulose helps by lowering ammonia levels through the gut. When bacteria in the colon break down lactulose, they produce acids that drop the pH inside the intestine. This acidic environment converts ammonia (which can be absorbed into the blood) into ammonium (which cannot). The ammonium stays trapped in the colon and is expelled with stool. At the same time, the laxative effect speeds everything through, giving the body less time to reabsorb ammonia.
For hepatic encephalopathy, doses are typically higher than for constipation. In acute episodes, hourly doses of 30 to 45 mL may be used initially to produce rapid bowel clearance. The goal during ongoing treatment is usually to produce two to three soft stools per day, which keeps ammonia levels consistently low. In some patients, reversal of coma has occurred within 2 hours of the first dose, though response times vary widely.
How Enulose Differs From Other Laxatives
Most over-the-counter laxatives either stimulate the intestinal muscles directly or bulk up stool with fiber. Enulose takes a different approach. Because it’s a sugar your body can’t digest, it acts purely through osmotic pressure and bacterial fermentation in the colon. This makes it gentler on the intestinal lining and suitable for longer-term use in people with chronic conditions, particularly liver disease patients who may need it indefinitely.
It also has a unique dual function that standard laxatives don’t offer. No other common laxative lowers blood ammonia levels the way lactulose does, which is why it remains a first-line treatment for hepatic encephalopathy.
Common Side Effects
The same fermentation process that makes Enulose effective also causes its most frequent side effects. Gas and bloating are very common, especially in the first few days. Abdominal cramping, nausea, and diarrhea can also occur. These effects are usually dose-related, meaning they tend to improve if the dose is reduced slightly.
Because Enulose increases the frequency of bowel movements (intentionally so for hepatic encephalopathy), prolonged use at higher doses can lead to dehydration or electrolyte imbalances, particularly low potassium. If you’re on Enulose long-term, periodic blood work to check electrolyte levels is standard practice. Signs of electrolyte problems include muscle weakness, irregular heartbeat, and excessive thirst.
Who Should Avoid Enulose
Enulose is made from two sugars: galactose and fructose. People with galactosemia, a rare inherited condition where the body cannot process galactose, should not take it. People with diabetes should be aware that while Enulose is poorly absorbed, it does contain sugars that could affect blood glucose levels at higher doses. Elderly patients on Enulose for hepatic encephalopathy are at higher risk for dehydration and electrolyte shifts, so closer monitoring is typically warranted.
What to Expect During Treatment
Enulose comes as a sweet, syrupy liquid. Many people mix it with water, juice, or milk to make the taste more tolerable. For constipation, you’ll generally take it once daily. For hepatic encephalopathy, dosing is more frequent and adjusted based on how many soft stools you’re producing each day.
If you’re taking Enulose for constipation, give it at least 48 hours before judging whether it’s working. For hepatic encephalopathy, improvements in mental clarity can sometimes happen within hours, but the full effect on ammonia levels builds over days. In both cases, the dose is often adjusted gradually rather than set at a fixed amount, since the ideal dose is the one that produces the desired number of daily bowel movements without causing excessive cramping or diarrhea.