Review Question - QID 108844

A 47-year-old female presents to her primary care physician complaining of diarrhea and fatigue. She reports an eight-month history of increasingly frequent diarrhea, fatigue, and muscle weakness. She currently has over 15 episodes of watery diarrhea per day despite fasting. Her past medical history is notable for diabetes that is well controlled with metformin. Her temperature is 98.6°F (37°C), blood pressure is 100/70 mmHg, pulse is 95/min, and respirations are 18/min. Physical examination is notable for mild diffuse abdominal pain and facial flushing. An upper endoscopy is performed and the stomach is found to be less acidic than normal. In addition to correcting this patient’s dehydration, which of the following medications is most appropriate in the management of this patient?