What are the health complications from a Zoloft (sertraline) overdose? What is serotonin syndrome?

Life threatening. Seratonin syndrme is caused by having too much seratonin. Symptoms include headache, agitation, hypomania, mental confusion, hallucinations, coma shivering, sweating, hyperthermia, hypertension, tachycardia, nausea, diarrhea. Myoclonus (muscle twitching), hyperreflexia (manifested by clonus), tremor.