If your vet did not prescribe antibiotics then I don’t think you should be giving them.yes it confused me too lol, yes they suggested i give them ivermectin, also suggested that the 8in1 spray is α good product but i didn’t know if i was supposed to give them antibiotics and i started worrying and was going to call in the morning and ask if i was supposed to be doing that, this is my first time treating them so i didn’t know if i was doing anything wrong, thank you for setting things straight.