A nurse is providing discharge teaching to the parent of a child who is prescribed diphenhydramine 25 mg elixir every 4 hr as needed. The amount available is diphenhydramine elixir 12.5 mg/5 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)

Given: Desired dose: Diphenhydramine 25 mg Available concentration: Diphenhydramine elixir 12.5 mg/5 mL To find: Volume to administer per dose (in mL) Step 1: Set up the proportion We can use the following proportion to solve the problem: (Desired dose) / (Available concentration) = Volume to administer Step 2: Substitute the values Plugging in the given values, we get: (25 mg) / (12.5 mg/5 mL) = Volume to administer Step 3: Simplify To simplify, we can invert the denominator and multiply: (25 mg) x (5 mL / 12.5 mg) = Volume to administer The "mg" units cancel out, leaving us with: (25 x 5 mL) / 12.5 = Volume to administer Step 4: Calculate Performing the multiplication and division, we get: 125 mL / 12.5 = Volume to administer 10 mL = Volume to administer