Review Question - QID 212895

A 59-year-old man is brought to the emergency department for changes in mental status. His wife noticed that since lunch time today, he has been “zoning out” and forgetting simple things such as where the bathroom is. She decided to call the ambulance as he got uncharacteristically violent during dinner when he threw his plate to the floor. The patient denies fevers, weight loss, chills, chest pain, or shortness of breath, but reports mild abdominal discomfort and some dark stools that he attributes to iron supplements. A physical examination demonstrates a moderate fluid wave of the abdomen and shaking of the hands while the wrists are extended. What is the mechanism of action of the medication that can treat this patient’s condition?