TUMS Ultra Strength Chewable Antacid Tablets go to work in seconds by starting. to neutralize acid on contact to bring fast and powerful ultra strength,. chewable heartburn relief. When symptoms occur, chew and swallow two to three. ultra strength tablets, depending on the severity of your acid indigestion. Featuring the active ingredient calcium carbonate, these antacids provide. heartburn, acid indigestion and sour stomach relief, as well as upset stomach. relief associated with these symptoms. TUMS antacid tablets are the number 1. recommended adult antacid brand by doctors, pharmacists and OB-GYNs. As. America's number 1 antacid and trusted as a heartburn medicine for 90 years,. TUMS is fully supported with a satisfaction guarantee. These calcium carbonate. tablets are gluten free and kosher. Packaged in a resealable bottle, this. heartburn and acid indigestion relief medicine is convenient to keep in your. car or office for whenever heartburn strikes. Choose TUMS Ultra Strength 1000. mg antacid tablets for fast acting heartburn relief, at home or on the go.