A health care provider has prescribed hydroxyurea 20 mg/kg per dose by mouth to an 8 year old child as part of a treatment regimen for sickle cell disease. This is a safe dose. The child weighs 55 lb. How many milligrams should the nurse administer? Enter only the number.

The correct answer is 500. To calculate the dose, first convert the child's weight from pounds to kilograms (55 lb ├À 2.2 = 25 kg). Then, multiply the weight by the prescribed dose (20 mg/kg) to get the total dose (25 kg x 20 mg/kg = 500 mg). This is the safe dose for the child. Other choices are incorrect because they do not follow the correct conversion and calculation steps, resulting in inaccurate dosages.