This webpage is maintained by the Centers for Disease Control and Prevention (CDC). The webpage provides information and resources on Arsenic. "Acute ingestion of toxic amounts of inorganic arsenic typically causes severe gastrointestinal signs and symptoms (e.g., vomiting, abdominal pain, and diarrhea). These signs and symptoms might rapidly lead to dehydration and shock. Different clinical manifestations might follow, including dysrhythmias (prolonged QT, T-wave changes), altered mental status, and multisystem organ failure that might ultimately result in death (1-4)."
Centers for Disease Control and Prevention: http://www.cdc.gov/