Alka Seltzer Gold Effervescent Heartburn Relief Antacid Tablets Without Aspirin provide fast heartburn, acid indigestion and sour stomach relief. These antacids contain potassium bicarbonate, anhydrous citric acid and sodium bicarbonate, which start neutralizing stomach acid in seconds and provide heartburn and acid indigestion relief. Available in effervescent tablets without aspirin, Alka Seltzer Gold quickly dissolves in water, bringing you fast and fizzy relief that is safe for sensitive stomachs.