deerman-
I am simply trying to make available information that has been given to me by professionals in the field. The vet mentioned above does regularly treat birds, including chickens. If what you've done works with your birds, that's great. If you disagree with me, advocate for your method, but there is no reason to be hostile.
In my opinion, the opinion of my vet and 2 other DVMs I've spoken with since this topic came up, giving Tylan-50 to a different species than indicated doesn't change the composition and correct administration of the drug, which is IM.
A horse wouldn't be given a Intramuscular West Nile Virus vaccine intravenously and a diabetic wouldn't drink a bottle of insulin that is designed to be injected.
I don't believe this forum is intended for squabbling among us; we're here to help, not degrade and attack each other. If you have further comments or want to debate about poultry drugs, feel free to PM me.
Otherwise, all the best to you Cheryl, and I do hope this thread was helpful.