For fast-acting and long-lasting heartburn relief, go for the Gaviscon Extra-Strength Tablets. They relieve heartburn, acid indigestion, sour stomach and upset stomach associated with these symptoms. Gaviscon extra-strength antacids are chewable and have an original flavor. Each pack contains 100 tablets, enough for a prescribed dosage. With a unique antacid barrier, these heartburn relief tablets help keep acid levels down for hours. The package comes with well-written instructions to offer guidance.