The Serotonin syndrome reference article from the English Wikipedia on 24-Apr-2004
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Serotonin syndrome

Serotonin syndrome refers to a condition where the brain contains too much serotonin. The symptoms of serotonin syndrome are, in order of progressive severity, headaches and dizziness, vomiting, unconsciousness, coma and death. Serotonin syndrome is generally caused by interactions between serotonergic drugs, for example by concurrent use of MAOIs and SSRIs.