I'm still compilig data on that one. In general, the B vitamins work best in the complex and a typical multi usually has thousands of times the RDA. Mega doses of B6 by itself can also cause some problems including neurological damage (as will bromo).
I think the whole bromo thing is just another excuse for these pseudo science types to introduce another drug into the array. SAM-e lowers prolactin as does Urtica Diorica, which in most cases will work just fine since prolactin elevation is rare. But if your nipples are leaking milk, I'd suggest not looking for answers on a message board. You better get your ass to a doctor.