Hill's nutritionists & veterinarians developed Prescription Diet® c/d® Multicare clinical nutrition specially formulated to support your cat's urinary health. In fact, c/d Multicare is clinically tested nutrition to lower the recurrence of most common urinary signs by 89%. This product promotes desirable urine pH levels. It is enriched with antioxidants, potassium citrate & Omega-3 fatty acids. This product requires a veterinary prescription.