I may have to give up

[Ravynscroft]

Darn are you sure? Some of the reviews seem quite promising, I was gonna try it for a hen that I have with breathing problems

Yep... if it's just breathing issues, no runny nares, bubbles in eyes, or any other reapiratory related issues, might try deworming first if you haven't... if a vet can do a fecal float first, that's always best... if it's a sure thing respiratory issue, then a type of antibiotic may be needed like Denegard, Tylan, etc, depending on which type it is...