TSC does not have Tylan 50, just the 200 and that costs $33, not worth it. I do have a bottle of Penicillin, can I use that? If so, how much and where do I inject it? This is a Pekin duck, not fully grown and was attacked by a stupid fox about a week ago. He doesn't want to die, been moving, eating and drinking/swimming more each day. So I guess he weighs around 5-7lbs, no idea. How much per pound do I give a duck? We don't have any Baytril, dog used it all on her cough.