Comparative Pharmacology
Head-to-head clinical analysis: PREVACID NAPRAPAC 375 COPACKAGED versus PROTONIX.
Peer-Reviewed Evidence
Head-to-head clinical analysis: PREVACID NAPRAPAC 375 COPACKAGED versus PROTONIX.
PREVACID NAPRAPAC 375 (COPACKAGED) vs PROTONIX
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Lansoprazole, a proton pump inhibitor, suppresses gastric acid secretion by inhibiting the gastric H+/K+-ATPase at the secretory surface of the gastric parietal cell. Naproxen, a nonsteroidal anti-inflammatory drug, inhibits cyclooxygenase (COX-1 and COX-2) reducing prostaglandin synthesis, which mediates inflammation, pain, and fever.
Proton pump inhibitor that inhibits the H+/K+-ATPase enzyme system at the secretory surface of gastric parietal cells, blocking the final step of gastric acid secretion.
One tablet (naproxen 375 mg / lansoprazole 15 mg) orally twice daily.
40 mg orally once daily; alternatively, 40 mg IV once daily for 7-10 days.
None Documented
None Documented
Naproxen: 12-17 hours (mean 14 hours); allows twice-daily dosing. Lansoprazole: 1.5-2 hours (fast metabolizers) to 3-4 hours (slow metabolizers); clinically negligible due to irreversibly binding to proton pumps.
Terminal elimination half-life is about 1–2 hours in healthy individuals; in CYP2C19 poor metabolizers or hepatic impairment, half-life may increase up to 3–6 hours, but clinical impact is minimal due to irreversible binding to H+/K+-ATPase.
Naproxen: Approximately 95% excreted in urine as unchanged naproxen (10%) and metabolites (~60% 6-O-desmethylnaproxen and conjugates); <5% in feces. Lansoprazole: Primarily metabolized in liver; metabolites excreted in urine (14-23%) and feces (~22%).
Approximately 80% of a dose is excreted as metabolites in urine, with the remainder (≈20%) in feces via biliary elimination.
Category C
Category C
Proton Pump Inhibitor/NSAID Combination
Proton Pump Inhibitor