Ivermectin is dosed at 200 mcg/kg of body weight — which means your body weight determines exactly which tablet strength you need. A 60kg adult needs 12mg. A 75kg adult needs 15mg. A 90kg adult needs 20mg. This complete guide explains the weight-based calculation, provides a full dosing table for all body weights, and tells you exactly which strength to choose from 6mg, 12mg, 15mg, and 20mg.