10th June 2021

A 4-month-old boy has a large ventricular septal defect

A 4-month-old boy has a large ventricular septal defect. He is small for his age and has a history of recurrent respiratory tract infections this past winter. He is on diuretics and digoxin therapy for heart failure and has a nasogastric feeding tube.

Which of the following drugs is indicated to prevent infection in this boy?

Select the SINGLE most appropriate option from the list below. Select ONE option only.