Some farm supply stores have Ivermectin paste (1.87% strength). Not sure you need it, and I’m never sure of the dosage, but I believe it’s helpful in the first 10 days or so. If my info is wrong, I imagine someone will come along and correct me.
The paste dispenser is calibrated in 50lb increments, is apple-flavored and mixes easily with apple sauce.
Amazon carries Ivermectin (scroll down page):
A good friend and her husband took the paste. There are links on line telling you how much to take based on body weight.