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I recommend that you return that product and exchange it for tylan 50 injectable found in the cattle section. Neovet 325 treats enteritis associated with E Coli. I've dealt with E Coli and sneezing/wheezing arnt the symptoms of an E Coli infection. You are possibly dealing with a respiratory issue. But first, I recommend that you check and see if it's not an environmental problem causing the sneezing/wheezing, such as; ammonia fumes from soiled litter, dust from feed, dust from dirt baths, pollen, dander from feather loss during and after molt, smoke, chemicals on grass/soil, fungus or mold in coop etc...All of these examples can be corrected or eliminated prior to using an antibiotic. If none of them are a problem, then it's probably a respiratory disease. If you smell a foul odor about the head area of your hen, it's most likely coryza. Treatment is sulmet in conjunction with an antibiotic. If there isnt a foul odor, it's most likely a mild strain of mycoplasma gallisepticum (MG.) Treatment is tylan or denagard. Both of these diseases are contageous and MG can be passed through eggs. She will remain a carrier with either of these diseases. You will have to maintain a closed flock and practice strict biosecurity. Your other option is to cull her.
For MG: Tylan 50 injectable dosage is 1/2cc for standard size birds and 1/4cc for smaller birds. It is injected into the breast muscle once a day for 3 days, alternating each side of the breast. You can give it to your hen orally if you wish, same dosage once a day for 5 days. You should see improvement by the 3rd day if given orally but continue treatment to the 5th day. The reason you give it orally for 5 days is because it takes longer to absorb into their system to be effective, also some of it is excreted whereas when injected, it takes effect quicker and is easily absorbed. Pull the wattles down and her mouth will open, then squirt it in and release the wattles so that she can swallow it on her own. I dont recommend water soluable antibiotics, sick birds wont drink it. That's why it's always better to administer it to them orally yourself.
You can purchase denagard from QC Supply. There is a initial treatment dose then a monthly preventative dose. There isnt any withdrwal nor resistance to denagard.
Here's a link to respiratory diseases in poultry. Scroll down to "Infectious Coryza" and "Mycoplasma Gallisepticum (MG)" and read about them if you wish. Also a link about denagard:
http://edis.ifas.ufl.edu/ps044
http://www.denagard.com/pig-poultry-public/en/index.shtml
