Digestive Symptoms

• Serotonin syndrome can cause nausea, vomiting and diarrhea.
  
  

Cardiac Symptoms

• If you develop serotonin syndrome you may have a fast heartbeat or quick changes in blood pressure.
  
  

Other Symptoms

• Other symptoms of serotonin syndrome include restlessness, hallucinations, clumsiness and twitching and shivering.
  
  

Serious Symptoms

• Severe serotonin syndrome symptoms include fever, seizures and an irregular heartbeat.
  
  

Risks

• If serious serotonin syndrome goes untreated, victims can lose consciousness and die.
  
  

Treatment

• Physicians use fluids, muscle relaxants and anti-serotonin production drugs to treat serotonin syndrome.