Use a FELIWAY MultiCat Refill every month in order to continue to create harmony in your home and prevent tensions between your cats living together. Helps your cats get along better at home. Its continuous effect helps maintain constant harmony. Clinically proven and veterinary recommended.FELIWAY Multicat is designed especially for households with 2 or more cats. It helps stop destructive behavior that can ruin your relationship with your cat. If something disturbs your cat s environment such as a new pet visitors moving to a new home or even rearranging the furniture he may start urine marking scratching or even stop eating. FELIWAY products help control destructive urine marking and scratching associated with fear or stressful situations. Great to use in multi-cat households plug in the room that cats frequent most to keep tensions calm.