Bromo-Seltzer (acetaminophen, sodium bicarbonate, and citric acid),'s an antacid used to relieve pain occurring together with heartburn, upset stomach, or acid indigestion. Originally produced by inventor Isaac E. Emerson's Emerson Drug Company of Baltimore, Bromo-Seltzer's sold in the United States in the form of effervescent granules which must be mixed with water before ingestion. In the days of classic radio, it was known for its slogan which was repeated rhythmically in imitation of a railr… (More on Bromo-seltzer)