Formula: Dissolve magnesium carbonate, 15, in a solution of citric acid, 33; add syrup of citric acid, 60; then crystals of potassium bicarbonate, 2.5. Cork the bottle and wire immediately. The product effervesces when uncorked.

Dose. - 2-8 fluidounces (60.0-237.0 Cc.) [12 fluidounces (360 Cc), U. S. P.].