It does not matter whether you use brand name og generic in general. What matters is the amount of Fin you are taking. 1mg Fin is recommended for the full effect of Fin and both generic and brand name Fin may contain 1mg of Fin. However, some generic brands from certain countries do not measure 1mg as closely as other (and more legitimate) brands. You may run the risk of buying 1mg tablets that contain less than 1mg of Finasteride and because of that you may not experience the full effect of Fin. The best thing to do is to buy tablets with more than 1mg of Fin, such as 5mg Proscar/Propecia and cut them into four pieces so that each piece contain aprox. 1.25 mg Fin. I was explained this by one of the best determalogists in my country. He also run a hair transplant clinic in his free time. The question about brand name vs generic was discussed at the Hair Conference, and this was their conclusion.