Better to keep them healthy, then to start pouring drugs into them. It is much less costly that way. But, first I would start researching the causes of sickness. There are any number of threads already started here on this site.
I would also read this complete reference material. http://www.avianmedicine.net/ampa.html
Perhaps the book "Feed to Win" would also be helpful.
I would also read this complete reference material. http://www.avianmedicine.net/ampa.html
Perhaps the book "Feed to Win" would also be helpful.