VetIQ Serene-UM is formulated with natural ingredients for hyperactive or nervous cats and dogs. It has been recommended by Veterinarians to ensure your pet remains calm during periods of stress and anxiety, without having a sedative effect. Suitable for separation anxiety, noise phobias, fireworks or hyperactivity. VetIQ Serene-UM is a tasty tablet which can be given whole or crushed over food. Starts working 6-8 hours but for maximum effect allow 24-36 hours.