VetIQ Serene-UM drops have been especially formulated for cats and small dogs up to 10kg and contains natural ingredients for hyperactive or nervous cats and dogs to help calm and pacify your pet without the need for tranquilisers. VetIQ Serene-UM has been recommended by Veterinarians and can help calm and pacify your pet without the need for tranquilisers in a totally natural way and as it is not a sedative, it does not cause drowsiness. VetIQ Serene-UM works by controlling the underlying emotional state to calm your pet, so that behaviour learned from a stressful situation can be corrected through retraining. In essence, VetIQ Serene-UM treats the source of the problem not the symptom. Serene-UM is also extremely beneficial for showing, training and obedience work. Starts working 6-8 hours but for maximum effect allow 24-36 hours.