Can psychedelic drugs help with depression?

This article [here] reports that a number of new medicines for depression (and anxiety) are being tested. These new treatments include drugs that have been available for a number of years, but have been previously used for other purposes. One such example is the illicit psychedelic drug LSD, which may remedy some of the negative changes to the brain that can occur in depression. Of course it is important not to take any such drugs unless under medical supervision.