A nurse is preparing to administer dextromethorphan 30 mg PO. Available is dextromethorphan oral liquid 7.5 mg/5mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Calculation: Identify the ordered dose and available concentration Ordered Dose: 30 mg Available Concentration: 7.5 mg/5 mL Calculate the volume to administer Volume (mL) = (Ordered Dose ÷ Concentration) × Volume Volume = (30 ÷ 7.5) × 5 Volume = 4 × 5 = 20 mL