well is 8ths still effective or not?
I concur with Mew. I originally divided up my Proscar tablets into 10 pieces (.5mg per tab)--I, too, was apprehensive in starting Proscar, hence my low initial dosage. I noticed an effect in about two or three days. Almost immediately, my shedding slowed to about half of what it was previously. But to make a long story short, I eventually settled on .625mg of Proscar per dose--dividing a tablet into 8 pieces. For me, .625mg is the minimum amount I would take, and I've been taking Proscar for about 16 months.
In sum, it's been effective for me, although not without some side effects--weight gain being the most prominent.