Comparative Pharmacology
Head-to-head clinical analysis: DUPHALAC versus GO EVAC.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DUPHALAC versus GO EVAC.
DUPHALAC vs GO-EVAC
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
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.
Promotes gastrointestinal motility by acting as a stimulant laxative, likely through direct irritation of the colonic mucosa and possibly via local effects on enteric neurons.
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.
10 mg orally once daily, with or without food.
None Documented
None Documented
Not applicable; systemic exposure is negligible. Orally administered lactulose acts locally in the colon.
4.5-6 hours in healthy volunteers; prolonged to 10-14 hours in elderly patients and those with moderate renal impairment (CrCl 30-50 mL/min).
Lactulose is not absorbed from the gastrointestinal tract; it is excreted unchanged in feces (>99%).
Primarily renal; approximately 60% eliminated unchanged in urine within 24 hours, with 20% as metabolites. Biliary/fecal excretion accounts for 15-20%, and the remainder is metabolized via glucuronidation.
Category C
Category C
Osmotic Laxative
Osmotic Laxative