What is your approach to recurrent uric acid stone formers who have a persistently acidic urine pH and are unable to tolerate potassium citrate?

I use sodium bicarbonate. I teach the patient how to titrate the dose using pH dipsticks to get the urine pH >6.0. Although sodium may increase urine calcium excretion, in uric acid stone formers, this is not an issue. Long experience with sodium bicarbonate tells us it does not raise blood pressure...