A nurse is preparing to administer lidocaine 50 mg IV bolus. Available is lidocaine 200 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Step 1: Identify desired dose and concentration Desired dose = 50 mg, Concentration = 200 mg/mL Step 2: Use the formula Volume (mL) = Desired dose ÷ Concentration Step 3: Insert values = 50 ÷ 200 Step 4: Calculate = 0.25 mL Step 5: Round to the nearest tenth ≈ 0.3 mL