This site has the correct dosing information: https://covid19criticalcare.com/covid-19-protocols/i-mask-plus-protocol/ It ranges from 0.2mg/kg of body weight for chronic prevention to 0.4mg/kg of body weight for post-exposure prevention, to 0.4 to 0.6 mg/kg for early treatment. Page 2 of the handout has a dosage chart by body weight for the 0.2mg/kg dose. For Durvet 1.87% ivermectin, a 6.08g tube contains 6.08g*1.87/100 = 113mg of ivermectin. There are 25 notches on the applicator so each notch =113mg/25 = 4.5mg/notch. For the 0.2mg/kg dose, this works out to about one notch per 50 lbs of body weight, which is the dosage marked for horses on the applicator. Multiply by 2 or 3 to get to the post-exposure or early treatment doses.