Yes it does, you know there are all sorts of parasites and viruses we live with and Ivermectin cleans the system.
For a preventative you take it 4 days in a row and then once a week for 4 weeks. You do notice the difference when you take it.
Did you use the human or the horse preparation? I’ve had a tube of the durvet horse version for a while, but haven’t tried it yet.