I'm not sure I'm no doctor, but im pretty sure it doesnt have any anti androgenic properies. Wiki states: Tamsulosin is a selective ?1 receptor antagonist that has preferential selectivity for the ?1A receptor in the prostate versus the ?1B receptor in the blood vessels.[5]
The bottom line is this will do nothing for hair loss, it's just designed to help improve urination for people with Prostate issues.