A mother calls the nurse to report that at 0900 she administered an oral dose of digoxin to her 4-month-old infant, but at 0920 the baby vomited the medicine. Which instruction should the nurse provide to this mother?

A. Withhold this dose: If an infant vomits shortly after receiving digoxin, the safest response is to withhold a repeat dose and consult the healthcare provider. Redosing could result in toxicity, especially since some absorption may have already occurred before vomiting. B. Administer a half dose now: Giving a partial dose without knowing how much was absorbed can lead to dosing errors. Digoxin has a narrow therapeutic range, making careful dosing essential. C. Give another dose: Re-administering the full dose risks digoxin toxicity, particularly in infants. Since some of the medication may have been absorbed, it is unsafe to give another full dose without medical supervision. D. Mix the next dose with food: Digoxin should not be mixed with food, as this can affect its absorption. Dosing should be consistent and based on exact measurements without altering the route or method.