A 22-year-old African American man who is a college student plans to travel to Africa for a semester of study abroad. A university student health physician prescribes chloroquine for malaria prophylaxis starting 2 weeks before the trip. Soon after starting the regimen, the patient develops scleral icterus. What is the most likely underlying cause for the icterus?

A 22-year-old African American man who is a college student plans to travel to Africa for a semester of study abroad. A university student health physician prescribes chloroquine for malaria prophylaxis starting 2 weeks before the trip. Soon after starting the regimen, the patient develops scleral icterus. What is the most likely underlying cause for the icterus?

A 58-year-old woman presents to the ambulatory care clinic with repetitive, uncontrollable lip smacking and puckering. Past medical history includes Type-2 diabetes for which she takes glipizide and metformin, hypercholesterolemia for which she takes lovastatin, bipolar disorder for which she takes haloperidol, and hypertension for which she takes hydrochlorothiazide. Which of her medications is likely causing her symptoms?

A 25-year-old G1P0 woman presents to the emergency department with shaking chills, chest pain, and productive cough. A chest X-ray reveals an area of opacity in the right lower lobe. The physician's choice of antibiotics is limited because some may harm this patient's fetus. Which of the following antibiotics may cause hearing loss in her fetus?

A 26-year-old sexually active man presents to his primary care physician with a nonpruritic maculopapular rash on his palms. He reports that about 6 weeks ago, he developed a nonpainful ulcer on his penis that healed spontaneously. Benzathine penicillin G is administered. Twelve hours later, he begins to have myalgia, fever, and chills. What is the most likely cause of this new onset of symptoms?

A 23-year-old woman presents to her primary care physician with dysuria and urgency. Urine is positive for leukocyte esterase and nitrites. Her physician prescribes co-trimoxazole for her UTI. How does co-trimoxazole inhibit bacterial growth?