Serotonin Syndrome

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Serotonin syndrome, also known as hyperserotonemia or serotonergic syndrome, is a potentially life-threatening condition in which there is an excess of serotonin in the central nervous system.

Causes:

Serotonin syndrome may be caused by use of high doses of serotonergic drugs, combination of more than one serotonergic drug or when antidepressants are switched without allowing for a "washout" period.

http://depression.about.com/od/depressionm...p/serotonin.htm