Propecia minimizes effects of THD, of which is a side derivative of some steroids more than others, hence, having a differing effect. but that is all this rookie can offer ya. Someone else has to put those pieces together.
I can't imagine why propecia/proscar would not work while on dbol? It inhibits the coversion of Test to DHT. I don't think it cares if you are on dbol or not. Lets see what the vets think.
firstenrgy