A 54 year old man who had taken puffer fish and noticed generalized weakness 1 hour and 30 minutes afterward was admitted to our I.C.U. due to respiratory arrest and cardiac arrhythmia. He was treated with artificial respiration via pressure cycled respirator, supportive therapy including frequent endotracheal suctioning. fluid administration, correction of acid base imbalance, change of position and antibiotics for prevention of secondary infection. 31 hours afterward, he resumed normal respiration and clear mentality. After 5 days of total admission days, he was discharged without any sequelae.