Comparative Pharmacology
Head-to-head clinical analysis: CHRONULAC versus GLYCOLAX.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHRONULAC versus GLYCOLAX.
CHRONULAC vs GLYCOLAX
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 hydrolyzed by colonic bacteria to form low molecular weight acids (mainly lactic and acetic acid), which osmotically draw water into the colon, softening stools and increasing stool frequency. Additionally, lactulose decreases colonic pH, which traps ammonia (NH3) as ammonium (NH4+), reducing serum ammonia levels.
Osmotic laxative. Polyethylene glycol (PEG) increases intraluminal water volume in the colon by osmosis, promoting stool passage and relieving constipation.
10-30 mL orally once daily to twice daily; for acute constipation, 20-30 mL initially; for hepatic encephalopathy, 30-60 mL every 1-2 hours to achieve 2-3 soft stools daily.
17 g (1 heaping tablespoon) dissolved in 4-8 ounces of liquid once daily, orally.
None Documented
None Documented
Terminal elimination half-life approximately 1.5-2.5 hours in adults with normal renal function; may be prolonged to 4-8 hours in patients with renal impairment.
Not applicable due to negligible systemic absorption; local colonic transit time approximately 2-4 hours.
Primarily renal (as unchanged drug and metabolites): ~40-50% of dose excreted in urine within 24 hours; biliary/fecal elimination accounts for the remainder, with approximately 2-5% recovered in feces as parent compound.
Minimally absorbed; excreted primarily unchanged in feces via osmotic action. Renal excretion negligible (<0.2% absorbed dose).
Category C
Category C
Osmotic Laxative
Osmotic Laxative