A medical student is involved in a summer research project evaluating the potencies of the α-adrenergic agonists at different receptor sites. Which of the following α-adrenergic agonists would be expected to have the strongest potency at the α-receptor?

A medical student is involved in a summer research project evaluating the potencies of the α-adrenergic agonists at different receptor sites. Which of the following α-adrenergic agonists would be expected to have the strongest potency at the α-receptor?

An 83-year-old woman with Parkinson's disease is currently being treated with carbidopa/levodopa, but her Parkinson's symptoms are worsening. She has normal liver function and no history of liver disease. The physician adds tolcapone to her regimen on tolcapone. How does tolcapone help in Parkinson's disease?

A 38-year-old man who is an inpatient in prison is serving a life sentence because of murder in the first degree. He is interested in suicide, but his only means is to overdose on coffee, which he has free access. The lethal dose of caffeine in grams and the estimated number of cups of coffee to achieve this is which of the following?

A 55-year-old woman with schizophrenia has been taking fluphenazine for 10 years to control her symptoms. At her regular 6-month checkup today, she complains of uncontrollable lip puckering movements. What is the next step the physician should take?

A 53-year-old woman with schizophrenia managed for years with chlorpromazine complains of a dry mouth, constipation, blurred vision, and feeling tired. Low-potency typical antipsychotics such as chlorpromazine are known to interfere with many neurotransmitter receptors aside from their target. Which of the following type of receptors is spared from antagonism by chlorpromazine?