Can a 9 yr old that is 52 pounds take an aleve?

Over-the-counter (OTC) pain relievers can be very effective for headaches in adults. Acetaminophen, ibuprofen, and aspirin are easily available and generally safe in small doses. Most of these are safe for children, as well. However, aspirin is an important exception. Aspirin is associated with a risk of Reye's syndrome in children. Therefore, you should not give aspirin to a child or teen unless specifically directed by a doctor

He can safely take one every 8 hrs.