Please explain why is dutasteride not approved by fda for hair loss treatement?

No studies submitted: In order for a drug to be approved by the fda for a specific problem, the company must do clinical studies that demonstrate that the drug does what they are perporting. Unless the makers of Dutasteride do studies demonstrating it is effective to stop hair loss, it can not be marketed for that purpose. It costs hundreds of millions of dollars to do these studies.