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A loading dose of terbutaline (Brethine) 250 mcg IV is prescribed for a client in preterm labor. Brethine 20 mg is added to 1,000 mL of D5W. How many milliliters of the solution should the nurse administer?

  • A. 45
  • B. 15 mL
  • C. 4
  • D. 13
Correct Answer: D

Rationale: To calculate the amount of terbutaline to administer, first convert the dose to the same unit. 250 mcg = 0.25 mg. Next, set up a proportion: 20 mg is to 1000 mL as 0.25 mg is to X mL. Cross multiply and solve for X: 20 X = 0.25 1000. X = (0.25 1000) / 20 = 12.5 mL. Therefore, the nurse should administer 13 mL of the solution.