If ketamine helps treat depression, why can’t doctors prescribe it?

The benefits of illegal drugs such as ketamine are widely known, yet the focus is still on antidepressants of doubtful value

Ketamine’s potential for fighting depression has been studied for years. Current reviews conclude that it is highly effective against depression – a promising new medicine, but potentially dangerous, both physically (you can lose your balance) and psychologically (it can produce psychotic-like states). But how does it work?