Liz Buchanan BVSc MRCVS
Hi - boring answer to this one I'm afraid - you really do need to check with your vet. The problem is that some drugs are protected with a special coating to stop them being absorped or damaged in the wrong place. For example, stomachs are full of Hydrochloric acid which will damage a drug passing thrpugh, so anything that is designed to be absorbed in the small intestine needs a special coating, and this effect is lost if the pill is broken. Your vet should be able to advise you for your cats' specific pills.