I'd be careful about using Ivermectin like that without some way to measure it more precisely...the "theraputic range" (the difference between effective and toxic) for ivermectin is rather thin. That is, it doesn't take much more from the real dose to cause ivermectin poisoning. Also, horse strength worming paste is sometimes 100x more concentrated than even the canine strength. This means that even a small discrepancy in the amount given can administer a radically different amount of the active ingredient (in this case Ivermectin)
I use injectible ivermectin for my mice; a simple subcutaneous injection under the skin at the back of the neck. I pick up insulin syringes for 6-8 bucks a pack, and just use that. This allows me to more readily control the concentration.
Don't mean to sound like an encyclopedia...I just spent the past 16 weeks having this drilled into me in Pharmacology class for my Vet Tech program lol
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