I think both fenben and ivermectin have been used before, during and after conventional therapy. But I am not a doctor and can't say how safe it is other than what I read as testimonials, and you know how testimonials go. Anything I "know" is just information I have gotten from the links I provided above and ones like them. Watch them and you will know all I know, if you believe what they have to say. The comments below the videos, both positive and negative, are sometimes interesting. I obviously do not read all of them because there are a zillion of them. But I might scan through the latest 25 or 50 to get a flavor of what they are saying.