Ivermectin for horses comes in syringes at farm supply stores over the counter in doses for an animal that is 1250 pounds in a paste form.
Human Rx is generally in 3 mg pills that need to be dosed up to fit the persons weight.
12 mg appx for 150 pounds.
Good luck finding a doctor who has the balls to Rx it.
And you need to find a small family owned pharmacy and pay cash - which is VERY expensive now.
Pharmacies are running out.