A nurse is preparing to administer methylphenidate 25 mg PO to a school-age child who has ADHD. Available is methylphenidate 10 mg/5 mL liquid. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Step 1 is: Identify the ordered dose = 25 mg. Step 2 is: Identify the available concentration = 10 mg ÷ 5 mL. Step 3 is: Calculate how many mg per 1 mL. 10 mg ÷ 5 mL = 2 mg per 1 mL. Step 4 is: Divide the ordered dose by the concentration. 25 mg ÷ 2 mg per 1 mL = 12.5 mL. Step 5 is: Round to the nearest tenth. 12.5 mL remains 12.5 mL.