A nurse is preparing to administer ampicillin 500 mg IM every 6 hr. Available is ampicillin 500 mg vial. The package insert instructs adding 1.8 mL of sterile water to yield ampicillin 250 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.) ________ mL

Step 1 is to identify the ordered dose and the concentration after reconstitution Ordered dose: 500 mg Available concentration: 250 mg / 1 mL Step 2 is to calculate the volume to administer in milliliters (mL) (Ordered dose ÷ Available dose) × Available volume = Result (500 ÷ 250) × 1 = Result 500 ÷ 250 = 2 2 × 1 = 2 Step 3 is to round to the nearest whole number 2 = 2 Answer: 2