Royal Canin Urinary S/O can be used to dissolve struvite bladder stones and is designed to reduce the risk of urinary crystal and stone formation. The wet formulation can also be used to manage feline idiopathic cystitis, the most common cause of lower urinary tract disease in cats.Prescription diets should only be used with the professional advice of your Veterinarian or Veterinary professional. If symptoms persist or you have any concerns please contact your local Veterinary practice.