Hi,
First of all , explain what DUPA is ,many people here may not know what it is before googling it.
as far as I am concerned , finasteride works as a DHT blocker , knowing that DUPA is diffuse thinning (means , has nothing to do with DHT,provided that you don't have androgenic alopecia which is on the contrary caused by DHT)
If you don't have androgenic alopecia , don't bother taking finasteride because your hair just needs to be stimulated (minoxidil would be more appropriate, it doesn't block DHT) , furthermore .... finasteride causes disagreeable side effects.