A 9-month-old infant with a history of three urinary tract infections is diagnosed with grade II vesicoureteral reflux. Which medication will be prescribed?

A 9-month-old infant with a history of three urinary tract infections is diagnosed with grade II vesicoureteral reflux. Which medication will be prescribed?

• A. Amoxicillin 10 mg/kg as a single daily dose
• B. Ceftriaxone IM 50 mg/kg as a single daily dose
• C. Nitrofurantoin 1-2 mg/kg as a single daily dose
• D. TMP-SMX; TMP 2 mg/kg as a single daily dose

Answer: (D)

In vesicoureteral reflux with recurrent urinary tract infections, the goal is to prevent new infections and protect the kidneys from scarring. For a young infant with grade II reflux and a history of multiple UTIs, daily antibiotic prophylaxis is commonly chosen to suppress bacterial growth in the urinary tract while the anatomy or function is monitored or awaits further management. TMP-SMX given at a low dose once daily provides reliable urinary antibiotic activity against the common pathogens that cause pediatric UTIs, has a practical dosing schedule, and is well tolerated in infants, making it a standard prophylactic option in this scenario. Amoxicillin daily would be less reliable due to increasing resistance among urinary pathogens. Ceftriaxone given by injection isn’t practical for long-term prophylaxis. Nitrofurantoin can be used as an alternative prophylaxis, but it has more potential side effects and is not as universally favored for ongoing protection in infants with VUR.

In vesicoureteral reflux with recurrent urinary tract infections, the goal is to prevent new infections and protect the kidneys from scarring. For a young infant with grade II reflux and a history of multiple UTIs, daily antibiotic prophylaxis is commonly chosen to suppress bacterial growth in the urinary tract while the anatomy or function is monitored or awaits further management. TMP-SMX given at a low dose once daily provides reliable urinary antibiotic activity against the common pathogens that cause pediatric UTIs, has a practical dosing schedule, and is well tolerated in infants, making it a standard prophylactic option in this scenario.

Amoxicillin daily would be less reliable due to increasing resistance among urinary pathogens. Ceftriaxone given by injection isn’t practical for long-term prophylaxis. Nitrofurantoin can be used as an alternative prophylaxis, but it has more potential side effects and is not as universally favored for ongoing protection in infants with VUR.