A 27-year-old man complains of occasional heartburn. His physician makes a few suggestions of diet and lifestyle changes he could make as well as some medications he can take for symptom management. The patient decides to try a magnesium hydroxide (MgOH) preparation. Which of the following is a side effect of MgOH that the physician should warn him about?

A 27-year-old man complains of occasional heartburn. His physician makes a few suggestions of diet and lifestyle changes he could make as well as some medications he can take for symptom management. The patient decides to try a magnesium hydroxide (MgOH) preparation. Which of the following is a side effect of MgOH that the physician should warn him about?

A 42-year-old man with HIV disease is hospitalized for refractory fungemia. He has begun on a course of caspofungin. After administration of the first intravenous dose, the patient develops flushing and sweats. What is the most likely mechanism of action for this finding?

A 43-year-old man with a history of peptic ulcer disease has developed hypersensitivity to H₂ blockers. He now complains of worsening of his dyspepsia. Physical examination reveals mild tenderness on the midepigastric region. If misoprostol is prescribed to this patient, which of the following mechanisms of action would be most plausible for this agent?

A 69-year-old man with a history of squamous cell carcinoma of the larynx underwent treatment with surgical resection and postoperative radiation therapy. He currently has significant xerostomia. Which of the following would be the best course of treatment for this patient?

A 19-year-old male presents to the emergency room with a broken ankle after a fall. He is given hydrocodone for the pain and, soon after, his stomach becomes upset. He has vomited once. The patient is given ondansetron to treat his nausea. What is the mechanism of action of ondansetron?