A nurse is preparing to administer 250 mg of an antibiotic IM. Available is 3 g/5 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies).

Convert the available concentration from grams (g) to milligrams (mg) per 5 mL. 1g = 1000 mg Available concentration = 3 g/5 mL = 3000 mg/5 mL. Determine the concentration in milligrams per milliliter (mg/mL). Concentration = 3000 mg / 5 mL = 600 mg/mL. Desired dose = 250 mg. Calculate the volume to administer. Volume (mL) = Desired dose (mg) / Available concentration (mg/mL) = 250 mg / 600 mg/mL = 0.4166... mL. Round the answer to the nearest tenth. = 0.4 mL.