A healthy bladder starts with the right balance of vital nutrients. Excess minerals can encourage the formation of crystals in the urine, which may lead to the creation of bladder stones. They can cause discomfort and lead to more serious problems that require the care of a veterinarian. Hills nutritionists & veterinarians developed Prescription Diet c/d Multicare clinical nutrition specially formulated to support your cats urinary health. In fact, c/d Multicare is clinically tested nutrition to lower the recurrence of most common urinary signs by 89%. This food requires a veterinary prescription. Hill's is updating their Prescription Diet packaging and a portion of the name. With Prescription Diet c/d, the current descriptor is "Urinary Tract Health"; in 2015 it will be "Urinary Care". For Cats Benefits Reduces the risk of struvite & calcium oxalate stones Recommended for lifelong feeding of adult cats Cautions Feed as directed by your veterinarian.