Do not use this product in kittens younger than 8 weeks and/or weighing less than 1 kg. Do not use in ferrets younger than 6 months. If your cat or ferret is sick, convalescent or hypersensitive to any of the active ingredients, do not use this product either. Amflee Combo may be used in cats during pregnancy. In ferrets, safety has not been proven during pregnancy and lactation.