TUMS is an antacid used to relieve heartburn, sour stomach, acid indigestion, and upset stomach associated with these symptoms. It works by reducing the amount of acid in the stomach, which provides fast heartburn relief. TUMS is available in more strengths and flavor varieties than any other brand. TUMS is not typically recommended for gas relief, as its active ingredient, calcium carbonate, is not effective at reducing gas. However, TUMS Chewy Bites with Gas Relief is effective for relieving flatulence, as it contains both calcium carbonate and simethicone, which alleviates gas by reducing the surface tension of gas bubbles, breaking them apart. If you have excessive gas, bloating, or gas pain, there are other OTC products, home remedies, and lifestyle changes that can provide relief.