A 45-year-old man with attention-deficit/hyperactivity disorder presents to his primary care physician for evaluation and treatment. Physical examination of the heart, lungs, and abdomen are within normal limits. The patient has begun on atomoxetine. Which of the following underlying disorders must the treating physician be aware of?

A 45-year-old man with attention-deficit/hyperactivity disorder presents to his primary care physician for evaluation and treatment. Physical examination of the heart, lungs, and abdomen are within normal limits. The patient has begun on atomoxetine. Which of the following underlying disorders must the treating physician be aware of?

A 35-year-old man who is an immigrant has been taking prazepam for anxiety for 10 years. This drug is not available in the United States, so he goes to see a physician about a drug that would be a good replacement. What might happen to this patient if he was unable to replace his prazepam and abruptly quit taking it?

A 64-year-old man presents with a shuffling gait, cogwheel rigidity, and a resting tremor. His physician prescribes levodopa and his symptoms greatly improve, supporting a diagnosis of Parkinson's disease. How does levodopa help this patient's symptoms?

A 67-year-old man with hypertension is treated with guanethidine. He has been taking this medication for years. His blood pressure is 130/86 mm Hg. Which of the following adverse effects must this patient be aware of?

A 66-year-old woman who has smoked two packs of cigarettes per day for 50 years has chronic bronchitis. She has tried to quit five times in the past but felt she could not go long without a cigarette. The nicotine in her cigarettes stimulates many cells in her body by binding certain receptors. Which of the following drugs blocks nicotinic receptors?