George McCann has been diagnosed with a subtype of bipolar disorder called the "fear of harm" profile, and finds that a prescribed dose of ketamine every few days alleviates his symptoms. Michael Rubenstein for NPR hide caption
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Linea Johnson, left, and her mother, Cinda, in May 2012 at the launch of their book on the family's struggle with Linea's bipolar disorder. Tommy Voeten hide caption