dex is a steroid like prednisone, i started on 1mg of dex first, according to alan beers book its best to start with dex for PCOS pts., till we got a heartbeat then we change to prednisone 25mg. so if ure on prednisone already ure all good. my FS doesnt believe in dhea or anything either. i just research my self and took matters into my own hands so to speak i was tired of doing the same thing over and over again with the same bfn result!!!!