A 21-year-old male college student complains of difficulty falling asleep at night. He asks if there is anything “mild” he can take to help him get to sleep. Which of the following hypnotics mimics an endogenous hormone?

A 21-year-old male college student complains of difficulty falling asleep at night. He asks if there is anything “mild” he can take to help him get to sleep. Which of the following hypnotics mimics an endogenous hormone?

A 56-year-old man who is hospitalized for viral encephalitis develops pill-rolling tremors of the hands and cogwheel rigidity. He is thought to have parkinsonian symptoms that developed because of an underlying secondary cause. Which of the following is the most likely etiology of this condition?

A 15-year-old boy presents to clinic for follow-up for his tonic-clonic seizures. He reports that he has not had a seizure in the past 6 months. However, he has been more tired recently and is unsure why. A complete blood count is performed and shows megaloblastic anemia. The physician told the patient that this was most likely a side effect of his antiseizure medication. What is the most likely medication he was taking?

An 18-year-old woman presents to clinic because of difficulty with school. She recently started college and is living on her own for the first time. She is constantly preoccupied with wondering if the door is locked. She checks the lock at least 20 times before she is able to leave her apartment. This often makes her late for class. She had been on selective serotonin reuptake inhibitors in the past, but they are ineffective. What is the most appropriate treatment for this patient?

A 48-year-old woman with refractory seizure disorder has failed every antiseizure medication on her local pharmacy formulary. She is considered to be truly refractory to medical therapy and undergoes vagal nerve stimulation. The most plausible mechanism of action of this therapy is which of the following?