Comparative Pharmacology
Head-to-head clinical analysis: CEPHULAC versus XPHOZAH.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CEPHULAC versus XPHOZAH.
CEPHULAC vs XPHOZAH
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Lactulose, a synthetic disaccharide, is not absorbed from the gastrointestinal tract. It is metabolized by colonic bacteria to form short-chain fatty acids (e.g., lactic, acetic, formic acids), which acidify the colonic contents. In hepatic encephalopathy, the acidic environment converts ammonia (NH3) to ammonium (NH4+), which is poorly absorbed and excreted in feces. Additionally, the osmotic effect of lactulose draws water into the colon, softening stools and increasing bowel movements.
XPHOZAH (tenapanor) is a sodium-hydrogen exchanger 3 (NHE3) inhibitor. It acts locally in the gastrointestinal tract to inhibit NHE3, reducing sodium and phosphate absorption, leading to decreased serum phosphate levels.
30-45 mL (6.67-10 g lactulose) orally 3-4 times daily for constipation; for hepatic encephalopathy, 30-45 mL orally 3-4 times daily titrated to produce 2-3 soft stools per day, or 300 mL in 700 mL of water or saline as retention enema for 30-60 min every 4-6 hours.
10 mg orally three times daily (TID) with or without food.
None Documented
None Documented
Terminal elimination half-life is 7-10 hours (renal impairment: prolonged); systemic absorption is minimal (<3%) after oral administration, so half-life reflects clearance of absorbed fraction.
Terminal elimination half-life is approximately 14 days, supporting monthly subcutaneous dosing for sustained serum phosphate reduction.
Primarily renal (20-30% as unchanged drug) and fecal (up to 70% as unmetabolized drug via biliary elimination; following gastric acid-mediated degradation, only 5-10% reaches urine as intact lactulose; hepatic metabolism is negligible).
Primarily eliminated in feces (approximately 92%) as unchanged drug; renal excretion is negligible (<1%).
Category C
Category C
Laxative
Laxative