The primary healthcare provider prescribes 4 mg of morphine intramuscularly. The vial reads morphine sulfate, 10 mg/mL. How many milliliters should be administered?

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Study for the Archer Pharmacology Test to master dosage calculations and medication administration. Use flashcards and multiple choice questions with detailed explanations. Get ready for your exam!

Multiple Choice

The primary healthcare provider prescribes 4 mg of morphine intramuscularly. The vial reads morphine sulfate, 10 mg/mL. How many milliliters should be administered?

Explanation:
When a dose is given in milligrams and the vial provides a concentration in milligrams per milliliter, you convert the dose to volume using volume = dose ÷ concentration. For 4 mg required with a concentration of 10 mg/mL, the volume you need is 4 ÷ 10 = 0.4 mL. Double-check by multiplying the volume back by the concentration: 0.4 mL × 10 mg/mL = 4 mg, which matches the prescribed amount. Therefore, administer 0.4 mL intramuscularly.

When a dose is given in milligrams and the vial provides a concentration in milligrams per milliliter, you convert the dose to volume using volume = dose ÷ concentration. For 4 mg required with a concentration of 10 mg/mL, the volume you need is 4 ÷ 10 = 0.4 mL. Double-check by multiplying the volume back by the concentration: 0.4 mL × 10 mg/mL = 4 mg, which matches the prescribed amount. Therefore, administer 0.4 mL intramuscularly.

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