Eno Calcium Antacid TabletsEno Tablets Calcium Antacids This medication is used to treat symptoms caused by too much stomach acid such as heart bun, upset stomach, or indigestion. It is an antacid that works by lowering the amount of acid in the stomach. Check the ingredients on the label even if you have used the product before. Dose Adult and children ages 12 and over; Chew and swallow 2 4 tablets as symptoms occur, or as directed by a doctor. Precaution prolonged use of