Pen G dosage

[chickfan]

I have a small bantam rooster that has been in the house for a week or more, after he started isolating himself from the others, fluffing his feathers, etc. I posted yesterday that he now has some breath sounds that are not right. Almost a crunchy sound, as if eating a crisp cookie.
He isn't eating much...seemed to ignore a scrambled egg this morning. His legs are weak also.
I have no idea what is going on with him, but this crackling in his chest (or nose?) is new, and I've been hearing it about 3 days.
I am seriously considering giving him some Pen. G. What I have is Pen. G Procaine. Is that what you all use? It is all the feed store had, and I did give it to a chicken with an infected prolapse, and she is fine now.
He weighs only ounces....Trying to figure the dosage leads me into microscopic proportions. Would something less than 1/4 cc be about right? I don't want to make him worse, of course, but don't know of anything else to do for him.
Any help is appreciated.

 

[Rocky Top Chick]

I just finished up with a round of Pen g. My hen weighed 4 lbs and I was told to use .5 cc. I had a hard time finding a syringe small enough, but got one from work.

 

[chickfan]

Thanks for your input. I just posted on another thread...I went with about 1/4 cc and the chicken died in my arms. I don't know if it was too much Pen., or if it went into the wrong place (he was so very skinny and barely had a breast at all). He was not well, and not a happy chicken, but was so sweet and so favored by us, and I didn't mean to just kill him. I didn't have a 1cc syringe, but could pretty well see the dosage on a 3 cc. I'm just sick. I should have just left him alone.