A nurse is preparing to administer acetaminophen 320 mg PO every four hours as needed for pain. The amount available from the pharmacy is acetaminophen liquid 160 mg/5 mL. How many mL should the nurse administer per dose? (Round to the nearest whole number.)

Step 1: Identify the required dose and concentration. Required dose = 320 mg Concentration = 160 mg per 5 mL Result at step 1 = 320 mg ÷ (160 mg ÷ 5 mL) Step 2: Calculate the volume in milliliters. First, determine the milligrams per mL: 160 mg ÷ 5 mL = 32 mg/mL Result at step 2a = 32 mg/mL Now, calculate the volume: 320 mg ÷ 32 mg/mL = 10 mL Result at step 2b = 10 mL Step 3: Round to the nearest whole number. 10 mL is already a whole number. Result at step 3 = 10 mL