Source:

http://www.sciencealert.com/scientists-have-breached-the-blood-brain-barrier-for-the-first-time-to-treat-a-brain-tumour

This new technology to deliver drugs exactly at a specific brain region, although in this caser used for treating brain tumors, might be pivotal and provide a completely new approach to drugs targeted at various psychiatric disorders which are known to be caused by very local (as pposed to global) changes of brain metabolism.