A 38-year-old businessman is on a trip to Mexico when he develops diarrhea. He has to give a presentation in a few hours and needs rapid relief. He takes an antidiarrheal preparation containing loperamide. Which of the following is a property of loperamide that makes it useful in treating diarrhea?

A 38-year-old businessman is on a trip to Mexico when he develops diarrhea. He has to give a presentation in a few hours and needs rapid relief. He takes an antidiarrheal preparation containing loperamide. Which of the following is a property of loperamide that makes it useful in treating diarrhea?

A 55-year-old man with multidrug-resistant methicillin-resistant Staphylococcus aureus is treated with intravenous linezolid for 40 days. He is currently hospitalized in the intensive care unit. Which of the following consultations should be ordered in this patient at this time?

A 6-year-old boy returns home from his last day of school before thanksgiving break. Over the break, he develops a cough, stuffy nose, headache, and fever. His mother administers a cough syrup containing guaifenesin. Which of the following effects is likely caused by guaifenesin?

An 83-year-old woman nursing home resident complains of trouble falling asleep at night. Her daughter also mentions that her mother's mood appears depressed, and the nursing home staff state that she is not eating well. Which of the following medications could best help this patient?

A 38-year-old man with third-degree burns on 40% of his body undergoes a debridement procedure in the operating room. Succinylcholine is used at supratherapeutic dose. On postoperative day 1, the patient's serum potassium is 7.3 mEq/L. What is the most likely source of this problem?