Bicitra is used for renal tubular acidosis as Linda said, but remember this medication also contains 500mg per 5ml of sodium (citrate). It could be your doctor is using it as your child's sodium supplement? It comes "pre-made" from the manufacturer so it does not have to be prepared by the pharmacy. I know some other CAH kids have their sodium chloride supplement prepared by their pharmacy. Your doc could have thought this was easier.