Parenteral Medications

Parenteral medication is a medication that is administered to a patient by an injection or by an intravenous flow. The dose for an injection is calculated using the formula method or the ratio-proportion method that is described previously in this chapter.

For example, the prescriber might order Demerol 45mg IM prn to alleviate the patient's pain. The Demerol label states 75 mg/mL. This is the dose you have. The nurse must calculate the number of milliliters that should be administered to the patient. ( d ^

Using the basic formula here's the calculation:

45 1mL

75 1

45mL

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