Rennie Spearmint 24’s Pack is a fast and effective relief from heartburn and indigestion in a handy spearmint flavored tablet. It contains magnesium carbonate and calcium carbonate, which create an antacid that neutralizes stomach acid. The effective formula also relieves acid indigestion, dyspepsia, hyperacidity, gastritis, nervous indigestion, flatulence, upset stomach, indigestion during pregnancy, and acidity.