Rennie Dual Action Chewable Tablets provide fast, powerful relief from heartburn, indigestion and acid reflux by working in two ways: 1. Antacids (calcium carbonate and magnesium carbonate) get to work within two minutes, powerfully neutralising excess acid in the stomach. 2. Alginic acid soothes the burning pain in your chest, forming a protective barrier over the stomach to prevent acid escaping into the food pipe. ® Rennie is a registered trademark Fast, powerful relief Gets to work in 2 minutes 2x Action Heartburn & indigestion