A 16-year-old boy with cystic fibrosis undergoes many types of treatments intended to loosen and thin the mucus obstructing his airways in order for him to expel it. He also takes an oral pancreatic enzyme because his pancreas is unable to secrete sufficient amounts because of mucus obstruction. Which of the following medications thins cystic fibrosis mucus by cleaving extracellular DNA?

A 16-year-old boy with cystic fibrosis undergoes many types of treatments intended to loosen and thin the mucus obstructing his airways in order for him to expel it. He also takes an oral pancreatic enzyme because his pancreas is unable to secrete sufficient amounts because of mucus obstruction. Which of the following medications thins cystic fibrosis mucus by cleaving extracellular DNA?

A 75-year-old man with a 40-pack-year history of smoking and known chronic obstructive pulmonary disease complains of intermittent cough. Physical examination reveals wheezing, which is suggestive of bronchospasm. Which of the following is the most appropriate treatment for this patient?

A 33-year-old pregnant woman begins taking a new drug, Drug X, for morning sickness. Drug X has been found to have adverse fetal effects in animal models, but no adequate human studies have been done. Under which FDA pregnancy category would Drug X fall?

A 23-year-old woman with lifelong epilepsy controlled with medication has just found out that she is pregnant. She has seizures once a month but seem to be controlled at present. Which of the following statements about epilepsy in pregnancy is true?

A 38-year-old businessman is on a trip to Mexico when he develops diarrhea. He has to give a presentation in a few hours and needs rapid relief. He takes an antidiarrheal preparation containing diphenoxylate. Which of the following describes diphenoxylate’s mechanism of action?