A 76-year-old man presents to the clinic for follow-up of his benign prostatic hyperplasia. He has been doing well with his symptoms since starting finasteride. He no longer has as much difficulty starting his stream and feels that he empties his bladder completely. What is the mechanism of action of finasteride?

A 76-year-old man presents to the clinic for follow-up of his benign prostatic hyperplasia. He has been doing well with his symptoms since starting finasteride. He no longer has as much difficulty starting his stream and feels that he empties his bladder completely. What is the mechanism of action of finasteride?

A 54-year-old man with elevated cholesterol levels is treated with niacin. Within 2 weeks of starting therapy, he develops an uncomfortable feeling of warmth and itchiness. Which of the following is the most appropriate next step in the management of this patient?

A young married couple complains of being unable to conceive after 9 months of unprotected sex. The wife has normal TSH and FSH levels and a normal pelvic exam. They agree to a trial of letrozole to see if they can increase their fecundity. How does letrozole work?

A 57-year-old man with hyperlipidemia presents to the emergency department with severe pain in his first right toe. The pain is a 10 /10 and worse with any contact. The toe is erythematous, inflamed, and warm to touch. Joint aspiration confirms gout. He had an episode of gout about 10 years ago. What medication used to treat his hyperlipidemia may have led to his gout flare?

A 23-year-old healthy man receives an infusion of 100~mL of glucose solution. Which of the following curves would represent his plasma insulin concentration at 2~min after infusion?