ASA and Reye's Syndrome
Children and teenagers with viral illness (e.g., chicken pox or influenza) shouldn't take acetylsalicylic acid (ASA). The combination of influenza and ASA is linked to Reye's syndrome, a rare but serious condition affecting the brain and liver. Many over-the-counter cold medicines contain aspirin-type drugs. Therefore, it is best to avoid treating fever in children and teenagers with ASA (Aspirin).