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Ketamine used to be primarily used as a veterinary general anesthetic and occasionally a human anesthetic drug, but ketamine apparently is a fast acting antidepressant medication. It is a scheduled drug–i.e. restricted drug according to the DEA.
Ketamine, acts on the brain chemical glutamate. It can lift depression symptoms in just [...]

Transcranial Magnetic Stimulation is a big word for using magnetic fields to treat the brain.  The idea is that the magnetic waves can  stimulate the nerve cells of the brain.  The goal of the high magnetic field treatment is to treat depression and possibly other mental states.  It is non invasive and uses no drugs.  [...]