Citro-Soda has urinary alkalinising and gastric antacid properties.
Urinary alkalinizer: sodium bicarbonate increases the excretion of free bicarbonate ions in the urine, thus raising the urinary pH. By maintaining an alkaline urine, the actual dissolution of uric acid stones may be accomplished. Citrates (sodium citrate and citric acid) are metabolised to bicarbonates.
Gastric antacid: sodium bicarbonate, sodium citrate and citric acid react chemically to neutralise or buffer existing quantities of gastric hydrochloric acid but have no direct effect on its output. This action results in an increased pH value of stomach contents, thus providing relief of hyperacidity symptoms.