I used Pen on my bird that was attacked by a hawk. I got it from the fridge in a grain store. I believe it said the same thing. For some reason most chicken meds are necessarily made for chickens but other livestock. You just have to get the dosage rite. I have always had better results with injectible meds for some reason just because you can't always guarantee the bird is getting the proper dosage. Of course I never medicate unless absolutley necessary but in this case it worked.