Hi, Thanks for writing in. Your ultrasound shows the presence of a 4 mm stone in the upper pole calyx of right kidney. A 4 mm stone is a small one and it is possible that if you drink lots of water and fluids, the stone will be flushed out of your system. Cystone is an ayurvedic preparation and helps in reducing kidney stones in number and size. You can continue taking it. Additionally you must also take following precautions. (i) Visit washrooms regularly and avoid holding urine. (ii) Avoid eating foods that are high in oxalates like non veg, vegetables like spinach, tomato, cauliflower, brinjals, nuts like kaju, pista and almonds. (iii) If the stone enters the ureter and is on its way to the urinary bladder then you might experience a sharp and severe pain lasting for hours to days. At this time you must consult your doctor and take proper medications including anti spasmodics like hyoscine to control pain and allow the stone to pass through as quickly possible with additional muscle relaxants like alpha blockers which is given only on doctors prescription.