Comparative Pharmacology
Head-to-head clinical analysis: FAMOTIDINE CALCIUM CARBONATE AND MAGNESIUM HYDROXIDE versus GAVISCON.
Peer-Reviewed Evidence
Head-to-head clinical analysis: FAMOTIDINE CALCIUM CARBONATE AND MAGNESIUM HYDROXIDE versus GAVISCON.
FAMOTIDINE, CALCIUM CARBONATE, AND MAGNESIUM HYDROXIDE vs GAVISCON
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Famotidine is a competitive histamine H2-receptor antagonist that inhibits gastric acid secretion by blocking H2 receptors on parietal cells. Calcium carbonate and magnesium hydroxide act as antacids, neutralizing gastric acid via chemical neutralization.
Gaviscon forms a protective alginate raft on top of gastric contents, providing a physical barrier that prevents reflux of gastric acid into the esophagus. The alginate reacts with gastric acid to form a gel-like foam that floats on the stomach contents. Gaviscon also contains antacids (calcium carbonate and sodium bicarbonate) that neutralize gastric acid.
1 tablet (famotidine 10 mg, calcium carbonate 800 mg, magnesium hydroxide 165 mg) orally once or twice daily as needed for heartburn; maximum 2 tablets in 24 hours.
10-20 mL orally after meals and at bedtime, maximum 80 mL/day
None Documented
None Documented
Famotidine: 2.5-3.5 hours (prolonged in renal impairment, up to 20 hours when CrCl <10 mL/min).
Not applicable; Gaviscon acts locally in the stomach without systemic absorption of active ingredients. The alginate raft persists for 2-4 hours post-dose.
Famotidine: renal (65-70% unchanged), biliary/fecal (30-35%). Calcium carbonate: feces (unabsorbed calcium), urine (absorbed). Magnesium hydroxide: feces (unabsorbed magnesium), urine (absorbed).
Primarily fecal as insoluble alginate rafts; minimal renal elimination (<1%) as absorbed components (sodium, potassium, calcium) excreted in urine.
Category A/B
Category C
Antacid / Laxative
Antacid