Years ago I got all the Ivermectin (paste in a tube) I needed to treat my Chronic Lyme Disease from Tractor Supply. Sold as a "horse dewormer". Received this advice from a doctor and his wife, also a doctor, whose young son was suffering facial palsy from his CLD.
Dosage after interweb search:
“Jeffers Ivermectin Paste 1.87%” contains the active ingredient Ivermectin and FDA approved apple flavoring.
Dosage for horses and humans is the same, and is by body weight. 91 micro-grams per 1 lb of body weight. If you weight 200 lbs, you need to take 18200 micro-grams or 18.2 milligrams.
Weights are marked on the horse paste plunger for convenience."
Don't listen to FDA BS about "not approved for humans" which only means that it hasn't been studied/tested for covid. Ivermectin has been approved in pill form for humans as an anti-parasitic.