I have taken Duramectin everyday for the past year and a half. I use it on my face, ears, teeth....wherever I need it. You can't overdose it because it is a spore not a med. It will purge the parasites. I also use it on my dog and cat. My husband and I have not gotten sick since this mess started. I have never worn a mask...not once. Praise God for ivermectin.