FELIWAY® Optimum contains the patented latest generation of Feline Pheromone Complex, developed by the FELIWAY® research team. This new discovery delivers advanced calming messages, helping your cats feel comfortable and secure at home. FELIWAY® Optimum represents the next generation of pheromone technology with improved efficacy. FELIWAY® Optimum helps cats with the management of more signs of stress (such as urine spraying, vertical scratching, excessive hiding, and inter-cat conflicts), in more situations, and calms cats better than ever. Feliway® Optimum is the best choice: - patented new pheromone discovery, for improved efficacy - 93% of cat owners report enhanced serenity - supported by 20 years of feline stress expertise