Gaviscon

Gaviscon is a widely used over-the-counter medication for the treatment of gastroesophageal reflux disease (GERD), heartburn, and acid indigestion. Its primary mechanism of action distinguishes it from simple antacids; it contains an alginate (typically sodium alginate) which, upon contact with gastric acid, precipitates into a viscous, pH-neutral gel. This gel, often called a "raft," floats on top of the stomach contents, creating a physical barrier that prevents the reflux of acid and pepsin into the esophagus. Most formulations also include antacids like sodium bicarbonate or calcium carbonate, which neutralize existing stomach acid and provide carbon dioxide bubbles that help the alginate raft float. While the specific active ingredients can vary by region—with the UK version emphasizing the alginate raft and some US versions utilizing aluminum hydroxide and magnesium carbonate—the brand is synonymous with rapid symptomatic relief of reflux symptoms.

Brand names

GavisconGaviscon AdvanceGaviscon Double ActionGaviscon Extra StrengthGaviscon Infant

Other names

Alginate antacid