Eno Antacid contains a special formulation that provides fast, effective relief from: upset stomach discomfort after meals, heartburn, acid indigestion, and stomach upset due to excess stomach acidity. Eno contains sodium bicarbonate, sodium carbonate and citric anhydrous.

You should not use Eno Antacid if: you are on a sodium-restricted diet; have impaired renal function with oliguria, azotemia, or anuria; you have untreated Addison’s disease; acute dehydration; heat cramps; or severe myocardial damage.