Most kidney stones of less than 5 mm size should be able to pass spontaneously. However, larger sized stones, if asymptomatic could also be watched before it passes spontaneously. But, if the concerned stone causes obstruction which most likely would also cause symptoms, it would become an indication for surgical removal. Unfortunately, none of the medications are known to dissolve the formed stone. Potrate MB6 is citrate salt preparations which along with consuming more than 2 litres of fluid / day and low salt diet are standard measures recommended to prevent recurrent stone formation. In your case, it is fair enough to watch your stone closely unless it causes symptoms while hoping that it would pass spontaneously.