Until the death of actor Matthew Perry many people had never even heard of Ketamine. As a recreational drug, known as "Special K", it can be extremely addictive and dangerous. But, when used under supervision, this powerful drug can help people with depression and various other mental health issues.

Dr. John Krystal, a leading expert on the neurobiology and treatment of psychiatric disorders, offers insights into why and how a drug once used as a horse tranquilizer and anesthetic has become a lifeline for those suffering from clinical depression.

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