Hi, Usually every stone performer have a tendency to perform the stones again and again. Therefore, the only specific preventive and curative treatment for stones is to take plenty of fluids, so that the amount of urine is increased, which helps in flushing of stones or breaking these in small piece, which help in easy flushing of stone. Also, excessive urine does not facilitate the crystals to come together, thus preventing the stone formation. As far as, the medicines of Cystone and Neeri also have mainly diuretic actions besides other properties of easy passage of stones. Hence you may continue taking the same drugs, still emphasizing on the excessive fluid intake for easy passage and prevention of further stone formation. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Satnarain Bansal, General & Family Physician