A client has fentanyl 175 mcg IV every 2 hours as needed (PRN) for pain after surgery. The fentanyl is available in 0.05 mg per 1 milliliter vials. How many milliliters would the nurse administer with each dose? (Round to tenths or first decimal place)

Calculation: Convert the prescribed dose from micrograms (mcg) to milligrams (mg). Prescribed dose = 175 mcg To convert to mg, divide by 1000. Dose in mg = 175 mcg / 1000 mcg/mg = 0.175 mg. Available concentration = 0.05 mg/mL Calculate the volume to administer. Volume (mL) = Prescribed dose (mg) / Concentration (mg/mL) = 0.175 mg / 0.05 mg/mL = 3.5 mL.