Comparative Pharmacology
Head-to-head clinical analysis: PRILOSEC OTC versus RABEPRAZOLE SODIUM.
Peer-Reviewed Evidence
Head-to-head clinical analysis: PRILOSEC OTC versus RABEPRAZOLE SODIUM.
PRILOSEC OTC vs RABEPRAZOLE SODIUM
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Proton pump inhibitor that irreversibly inhibits the H+/K+ ATPase enzyme (proton pump) in gastric parietal cells, suppressing gastric acid secretion.
Rabeprazole is a proton pump inhibitor (PPI) that inhibits the gastric H+/K+-ATPase enzyme at the secretory surface of gastric parietal cells, thereby suppressing basal and stimulated gastric acid secretion. It is a substituted benzimidazole that accumulates in the acidic environment of the parietal cell and is protonated, forming a covalent disulfide bond with cysteine residues of the proton pump, leading to irreversible inhibition.
20 mg orally once daily for 14 days for frequent heartburn; may repeat 14-day course every 4 months.
Oral: 20 mg once daily; duodenal ulcer: 20 mg once daily for up to 4 weeks; erosive esophagitis: 20 mg once daily for 4 to 8 weeks; GERD: 20 mg once daily for 4 to 8 weeks; Helicobacter pylori eradication: 20 mg twice daily in combination with antibiotics.
None Documented
None Documented
Approximately 0.5–1 hour in healthy subjects; longer (up to 3 hours) in slow metabolizers or hepatic impairment. Clinically, the duration of acid suppression exceeds the half-life due to accumulation in parietal cell canaliculi.
1-2 hours in most individuals, but pharmacodynamic half-life is longer (24-48 hours) due to irreversible binding to proton pumps; clearance is reduced in hepatic impairment (half-life up to 12 hours)
Primarily hepatic metabolism; about 80% of metabolites are excreted in urine, and the remainder in feces via bile. Less than 1% of unchanged drug is excreted in urine.
Primarily renal (approx. 90% as metabolites, <1% unchanged) and fecal (approx. 10%)
Category C
Category A/B
Proton Pump Inhibitor
Proton Pump Inhibitor