Pyrethrin: these natural extracts are made from chrysanthemum flowers and affect the nervous system of insects. All pyrethrins are easily hydrolysed and degraded by stomach acids so toxicity following ingestion by pets is very low. Pyrethrins are generally safe for kittens as young as 4-6 weeks of age. Pyrethrin is NOT the same as permethrin. Permethrin is a synthetic pyrethrin and is less easily broken down than pyrethrin. Pyrethrins can be used on cats; permethrins should NOT be used on cats. However, there are some unusual cases of pyrethrins causing dribbling and unsteady gait in cats. If these occur, wipe off excess product and contact a veterinarian. Piperonyl butoxide (PBO) is a pesticide synergist when added to insecticide formulations.1g/L pyrethrins10g/L piperonyl Butoxide