Rennie Dual Action Chewable Tablets provide fast, powerful relief from heartburn, indigestion and acid reflux by working in two ways:n1. Antacids (calcium carbonate and magnesium carbonate) get to work within two minutes, powerfully neutralising excess acid in the stomach.n2. Alginic acid soothes the burning pain in your chest, forming a protective barrier over the stomach to prevent acid escaping into the food pipe.n® Rennie is a registered trademarknFast, powerful reliefnGets to work in 2 minutesn2x ActionnHeartburn & indigestion