For one week this has been the worst pinworm attack I have ever epxerienced. It is like having scorpions in my ass biting me or something. And a pocket of itching lice wiggling at the same time. I don't know what is going on. I keep telling myself the dark gets worse right before the worm is over. I'm goign to bombard them with oo and everything I can get my hands on. Ivermectin is an insecticide they give pigs and cows. I took six times the recommended amount and I can still feel them wiggling around inside of me. It is unbeleivable. I will keep you posted.