Ultra Strength Antacid Chewable Tablets TUMS Chewable Antacid Tablets go to work in seconds, so you can forget your heartburn and get back to the moments that matter. These ultra strength antacid chewable tablets contain double the acid neutralizing power per tablet of regular strength TUMS for fast acting relief. TUMS chewable antacid tablets contain the active ingredient calcium carbonate, which is naturally sourced, to quickly and effectively fight heartburn and relieve sour stomach, acid indigestion and upset stomach associated with these symptoms. TUMS heartburn medicine neutralizes acid on contact, giving you fast heartburn relief. Adults and children 12 years and older may chew two to three heartburn tablets as symptoms occur or as directed by a doctor. Known as a trusted brand to fight heartburn fast for 90 years, TUMS is the #1 physician, pharmacist and OBGYN-recommended adult antacid brand. With TUMS Ultra Strength Chewable Mint Antacid Tablets, you're ready when heartburn strikes.