Fast and Powerful Relief TUMS Ultra Strength Chewable Antacid Tablets offer quick and potent ultra-strength relief from heartburn. These tablets start working in mere seconds, neutralizing acid on contact to alleviate discomfort. Depending on the severity of your acid indigestion, chew and swallow two to three ultra-strength tablets when symptoms occur. Effective Ingredients These chewable antacids feature calcium carbonate as the active ingredient, effectively relieving heartburn, sour stomach, and acid indigestion. They also provide upset stomach relief associated with these symptoms. Trust TUMS to bring you the relief you need....