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. Administering a half dose now may lead to an incorrect dosage and potential toxicity. B. Giving another dose without medical guidance could result in overdose. C. Mixing the next dose with food may not ensure proper absorption and dosage control. D. Withholding the dose is the appropriate action to take after vomiting to prevent potential overdose or toxicity.