For parasites it is 0.2 mg/kg one time. Which doesn't make a lot of sense to me. Parasites have a life cycle and very few things kill the eggs. I've taken dewormers all my life (my mom believed it was really important and if we do it for our cats, humans should too). We were all dewormed about once a year. I've taken fenbendazole, the one that I can't remember the name of that tastes like overly sweetened milkshake, ivermectin and probably a few others over the years. Every fall I run through a couple rounds of either ivermectin or fenbendazole. I take a dose and then 5 days later a second dose and then two weeks later I repeat it just to make sure all the worms are dead. I've never even gotten a stomach upset from it and I'm one of those people who gets nauseous from everything and nothing.