FELIWAY Optimum calms cats better than ever and in more situations. It contains the patented latest generation of Feline Pheromone Complex, developed by the FELIWAY research team. This new pheromone discovery represents the next generation of pheromone technology with improved efficacy, delivering advanced calming messages, helping your cats feel comfortable & secure at home. It is clinically proven to help cats with the management of more signs of stress (such as urine spraying, vertical scratching, excessive hiding, & inter-cat conflicts), in more situations, and calm cats better than ever.