The healthcare provider prescribes furosemide (Lasix) 15 mg IV STAT for a client. On hand is an ampoule labeled, furosemide (Lasix) 20 mg/2ml. How many milliliters should the nurse administer?

• A. 1.0 mL
• B. 1.5 mL
• C. 2.0 mL
• D. 1.25 mL

Answer: (B)

Dose calculation from a labeled concentration: determine how much volume provides the prescribed amount. The ampoule shows 20 mg in 2 mL, which is 10 mg per mL. To give 15 mg, use volume = dose ÷ concentration = 15 mg ÷ (10 mg/mL) = 1.5 mL. Therefore, administer 1.5 mL of the solution.