Yes, I think Catty1's idea is a good one. It would probably be less expensive to get some Clindamycin and administer it yourself to your cats but Convenia is great. One injection and they're good for two weeks. I can definitely sympathize w/you and the vet expense. It comes in waves here. We go for a while w/no problems and then suddenly several get sick at once. The vet bills become crippling at times. I do hope that things improve for you and your furkids soon. Keep the faythe.