Royal Canin Veterinary Diet Urinary S/O is a prescription dry food formulated for adult cats diagnosed with lower urinary tract disease. It requires a veterinary recommendation and is designed to be fed under ongoing vet supervision.

The formula works by creating a urinary environment that actively discourages the formation of both struvite and calcium oxalate crystals — two of the most common types affecting cats. It achieves this through controlled mineral levels and a targeted urine dilution approach that increases urine output. The kibble is complete and balanced for long-term feeding as part of a managed care plan.

Cats prone to recurrent urinary blockages or crystal formation often need a long-term dietary solution rather than short-term intervention. Royal Canin Urinary S/O is one of the most widely prescribed options for this condition, and many owners feed it continuously once their vet has confirmed it as appropriate for their cat's specific case.