I have spent my entire day trying to figure out what I should do. I found my hen (approx. 3-4 years old) making a loud whistling / wheezing sound while mouth breathing. I cannot go to a vet and live in a very remote area. None of the feed stores have the good antibiotics anymore and all that was available to be is this Durvet penicillin injectable 100mg but it does not have "chickens" on it. I called the manufacturer and they cannot "give any off label advise" vets "can't give any advise" etc. The feed store gave me an 18g needle and this injectable. Can I use it? Should I use it? Is there any way I can give it orally? I also purchased some VetRx and administered. I separated her from my other girl and have them in separate cages inside until I figure this out. Any help will be a miracle at this point as to what I should do. The other option I have is some 500mg Amoxil from an old rx of mine (the date is 01/20/2020 and could either be when I got it or the exp date).