Liz Buchanan BVSc MRCVS
Hello - not being active 24/7, I suspect that the moment for this question has gone and would remind readers always to call their vets' phoneline if they need emergency advice 'out of hours' - the details of someone who can help you should be on the answerphone message, even if the vets are closed. However, in general, if an animal is very unresponsive and lethargic - more so that since they were last seen by a vet, or if the situation is continuing for longer than expected - then it definitely constitutes a reason to seek in-person emergency help. I don't know too much about your loved one, but hope that things went as well as they could have for him. The emergency vet would usually consult the Veterinary Poisons Informations Service or similar, in order to assess whether specific toxin-related treatment was needed. They would also offer to examine your cat, in order to establish whether fluids or other emergency treatments were necessary.