A 56-year-old man who is a chronic alcoholic is brought to the emergency department because of altered mental status. Blood tests reveal normal creatinine but indicate hyperammonemia. The patient is given lactulose after which his blood ammonia soon drops to a more suitable level. Which of the following organs is lactulose's site of action?

A 56-year-old man who is a chronic alcoholic is brought to the emergency department because of altered mental status. Blood tests reveal normal creatinine but indicate hyperammonemia. The patient is given lactulose after which his blood ammonia soon drops to a more suitable level. Which of the following organs is lactulose's site of action?

A 35-year-old G1P0 woman presents to her primary care physician at 35 weeks gestation with headaches. Her blood pressure is 164/90 mm Hg, although 6 months ago it was 124/74 mm Hg. She has no proteinuria and no edema. Which of the following antihypertensive would be best for this patient?

A 17-year-old female with cystic fibrosis began taking a new medication to help loosen the mucus in her respiratory tract. The patient has not been adherent to her regimen of this drug, complaining that its smell makes her sick. Which is the most likely drug?

A 24-year-old man complains of recurring episodes of bloody diarrhea and abdominal pain. A flexible sigmoidoscopy reveals pseudopolyps and erythematous, friable mucosa. One of the drugs given to this patient is diphenoxylate. How could diphenoxylate help this patient?

A 52-year-old woman complains of dizziness when she looks up or rapidly changes the position of her head. These dizzy spells are often accompanied by nausea and vomiting. She complains that these episodes severely limit her ability to work and function normally. Which of the following medications would best help control her symptoms?