People take TUMS, Alka-Seltzer, Milk of Magnesia, and many more when they experience heartburn, acid indigestion, or sour stomach.
What is another name for those antacids and how do they bring relief?
I imagine that the word you are looking for is "base." All of these antacids are bases.
The word "base" refers to something that is relatively high on the ph scale. The scale goes from 0 (most acidic) to 14 (most basic) with 7 being neutral.
There is, of course, acid in your stomach. Your stomach is usually around 2 or 3 on the scale. But sometimes it drops below that. When it does, it can be useful to eat a base so as to return the ph to the proper level.