It's administered orally, even though it's sold as an injectible.
As for dosage, I've seen it as high as:
1 ml per 5 pounds day 1
1 ml per 10 pounds day 2-5
Now, the reason I say as HIGH as is because that's also often the recommended dose for the 12.5% as well. For instance, that's the recommendation that fiascofarm.com gives using the weaker solution.
But, helmstead, who seems to have a nice healthy herd of nigi goats, recommends the higher dosage.
All that to say, I think the answers will likely vary on this one. Personally, I went with the higher recommendation when I had a baby with the squirts recently. I didn't want to take any chances and risk losing my babies. I had the 12.5% and I had to push an awful lot of that stuff down the throat of my 60 pound buckling. He thought he was gonna die. Actually, I kinda thought so too, simply because I've never had to give them anything that tastes so bad - they can be kinda dramatic. I'll be opting for the 40% once this stuff is gone. Either that or I'll mix the powder kind and make it a bit stronger (like half the water) - I think that's what Roll Farms does.
I would be interested in knowing what the prevention recommendation AFTER treatment is.
oops, I was typing while elevan was posting. Plus I tend to be over-wordy. Hers is the condensed version - short, but sweet!