The prescription for a 4-month-old is: penicillin G 150,000 units IM bid. The drug is supplied as a unit dose of 600,000 units in a 5-ml vial. The nurse should give the dose as:

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$ \frac{600,000}{5 \mathrm{ml}} \times \frac{\mathrm{ml}}{150,000}=1.25 \mathrm{ml} $ This dose would have to be given in divided doses as only 1 ml should be injected in one site on an infant.

The Prescription for a 4-Month-Old Is: Penicillin G 150,000 Units