Which medication is not recommended in pediatric patients due to risk of Reye's syndrome or encephalopathy?

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Aspirin is not recommended in children during viral illnesses because of the risk of Reye's syndrome, a rare but serious condition that can cause acute encephalopathy and liver failure. The association is strongest when aspirin is given during infections like influenza or varicella, leading to vomiting, confusion, and rapidly worsening liver function. The mechanism isn’t fully understood, but salicylates appear to trigger mitochondrial and metabolic disturbances in the setting of a viral illness. For fever or pain in kids, safer alternatives such as acetaminophen or ibuprofen are typically used, while diphenhydramine has other uses (like allergy relief) but isn’t indicated for fever management. In certain conditions, like Kawasaki disease, aspirin may be used under medical supervision, but routine pediatric use for fever or pain is avoided due to the Reye’s syndrome risk.