I've just heard that Sulmet, being a sulfa drug, is much harder on their systems than the Amprolium. That's just my experience.
And I'd like to clarify on the Tylan... as I stated above, "...if they're really not responding I've given Tylan 50 injectible to make sure that nothing else takes...
https://www.backyardchickens.com/forum/viewtopic.php?id=90731
Cocci seems to pop up more during the warm rainy season. I keep Amprolium (Corid 9.6%) on hand as I can't just run to the store to get it here. I've gotten it at First State, but www.Jedds.com has a 16 oz bottle for a pretty good...