Maybe look at internet Docs for human pills. Not cheap, but I think I am going to do it. I think it is $65 for the internet meeting and about the same to get your script. Can not believe the scum are making us scramble for an effective med.
Colloidal silver works better
I finally found some online (the local Tractor Supply stores were sold out) at statelinetack.com. $15 for a tube that is the one dose for a 1250# horse (ivermectin 1.87%). The conversion dosages i’ve seen are .2mg/kg of body weight as a prophylactic or .4mg/kg of body wt if you’re infected.