The injection in the "eye lid" will work ONLY if you are treating pinkeye and even then it's not 100%. Giving that injection takes talent and practice, as you are giving it Intradermally (between the layers of the skin) usually witha 20 x 1/2" needle. You want to be SURE you have an excellent chute with head table on neck sweep to hold them still. There is a new product on the market called Vetericyn Pink Eye Spray. Finally a product that is actually LABELED for use in food producing animals, and it works! The nice part about it, is that it does not sting or stain. We use it all the time in the feedlot, We give the shot in the eyelid, SQ dose of Noromycin 300 (a type of LA-200, but smaller dose 3cc/100# and lasts longer -5 days) spray it with Vetericyn Pink Eye Spray, then cover it with a Patch to help keep the light/irritation out.
If it is NOT pink-eye, using the Pfizer Vaccine called Inforce 3 will clear up most IBR viruses fairly quickly. 2cc up the nose, and it takes effect quickly, and last up to 6 months. No injection sight issues to worry about, and runs about .98/dose.
Becky