Alka-Seltzer Original is a fast-acting antacid and pain reliever that helps neutralize stomach acid and relieve heartburn, acid indigestion, and sour stomach. Each effervescent tablet contains 324mg of aspirin and 477mg of sodium bicarbonate, providing quick relief from discomfort. Ideal for adults and children over 12, it dissolves easily in water for fast absorption. The original formula has been trusted for decades to deliver effective relief from common digestive issues.