Comparative Pharmacology
Head-to-head clinical analysis: CHOLAC versus ENULOSE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHOLAC versus ENULOSE.
CHOLAC vs ENULOSE
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. It is metabolized by colonic bacteria to short-chain fatty acids, primarily lactic acid and acetic acid, which lower the colonic pH. This acidification traps ammonia (NH3) as ammonium (NH4+) in the gut lumen, reducing serum ammonia levels. Additionally, the osmotic effect of lactulose draws water into the colon, producing a laxative effect.
Lactulose is a synthetic disaccharide that is not absorbed from the gastrointestinal tract. It is metabolized by colonic bacteria to form low molecular weight organic acids, which lower the colonic pH and increase osmotic pressure, resulting in increased stool volume and laxative effect. In hepatic encephalopathy, the acidification of the colon inhibits the growth of ammonia-producing bacteria and promotes the conversion of ammonia to ammonium ion, which is trapped in the colon and excreted, thereby reducing systemic ammonia levels.
15-30 mL (10-20 g lactulose) orally once daily, titrated to produce 2-3 soft stools per day; maximum dose 60 mL/day. For hepatic encephalopathy: 30-45 mL (20-30 g) orally 3-4 times daily, titrated to 2-3 soft stools per day.
15-45 mL orally once daily, titrated to produce 2-3 soft stools per day. Maximum 60 mL per day.
None Documented
None Documented
0.5-1.5 hours for lactulose; active metabolites (e.g., acetic acid) have negligible systemic half-life due to rapid local metabolism.
Terminal elimination half-life is 2.1 hours in normal renal function; prolonged to up to 6 hours in renal impairment.
Primarily fecal (biliary excretion of unchanged drug and metabolites); minimal renal excretion (<5%).
Primarily renal (95% unchanged by glomerular filtration); biliary/fecal less than 5%.
Category C
Category C
Laxative
Laxative