That is interesting Teresa, explains why Milbemax is still a POM - you have got me thinking of what wormer Snowy had, as she had raised liver enzymes. I know everybody since has had Milbemax (can get Drontal cheaper, but end up with cats foaming at the mouth, so well worth the extra couple of quid!!). Out of interest, do you know what woudl happen if a CRF/liver issue cat was given Milbemax?