Tums are antacids that are used to treat heartburn, indigestion, and upset stomach caused by too much stomach acid. They work by reducing the amount of acid in the stomach, providing fast relief within seconds
. The active ingredient in Tums is calcium carbonate, which helps to neutralize stomach acid
. Antacids like Tums are the fastest-acting heartburn relief available because they start to weaken the acid in the stomach the moment they reach it
