Comparative Pharmacology
Head-to-head clinical analysis: CONSTULOSE versus DUPHALAC.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CONSTULOSE versus DUPHALAC.
CONSTULOSE vs DUPHALAC
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Lactulose is a synthetic disaccharide that is not absorbed in the small intestine. In the colon, it is metabolized by bacteria to short-chain fatty acids, leading to an osmotic effect that draws water into the bowel, thereby softening stools and increasing bowel motility. In hepatic encephalopathy, lactulose acidifies the colonic environment, promoting the conversion of ammonia (NH3) to ammonium (NH4+), which is trapped and excreted in feces.
Duphalac (lactulose) is a synthetic disaccharide that is not absorbed in the gastrointestinal tract. It is metabolized by colonic bacteria to short-chain fatty acids (e.g., acetic, lactic, formic acids), which lower colonic pH. This acidic environment favors the conversion of ammonia (NH3) to ammonium (NH4+), which is trapped in the colon and excreted in feces, thereby reducing systemic ammonia absorption. Additionally, the osmotic effect of lactulose and its metabolites draws water into the colon, producing a laxative effect.
10-20 g (15-30 mL) orally once daily, increased to 30-45 g (45-60 mL) if needed; or 30-45 g (45-60 mL) orally every 6-8 hours for hepatic encephalopathy.
Oral: 15-30 mL once daily, may increase to 30-45 mL twice daily if needed. Rectal (enema): 150-300 mL as a single dose.
None Documented
None Documented
Not applicable due to minimal systemic absorption; local action in colon. In cases of systemic absorption, half-life is not clinically relevant.
Not applicable; systemic exposure is negligible. Orally administered lactulose acts locally in the colon.
Primarily fecal (unchanged); minimal systemic absorption (<3%), thus negligible renal excretion.
Lactulose is not absorbed from the gastrointestinal tract; it is excreted unchanged in feces (>99%).
Category C
Category C
Osmotic Laxative
Osmotic Laxative