A nurse is preparing to administer amantadine 150 mg PO for a client who is experiencing parkinsonism due to an antipsychotic medication. Available is amantadine 50 mg/5 mL oral solution. 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.)

Step 1 is to determine the amount of amantadine needed, which is 150 mg as prescribed. Step 2 is to calculate the volume of the solution needed to deliver this dose. The available solution has a concentration of 50 mg per 5 mL. Using the formula: (Prescribed dose ÷ Available dose) × Volume per dose (150mg ÷ 50mg) × 5mL = 15mL Therefore, the correct answer is 15 mL.