I'm not 100% positive, but I think it was Proscar. The pharmacist quartered them all for me. I recently read somewhere that quartering the entire prescription might cause it to lose potency and to try quartering it one pill at a time. That said, when I switched back to Propecia, my pharmacist said several other people had done the same thing - tried Proscar, then went back to Propecia. Could be the placebo effect.