Final answer:
Painkillers such as acetaminophen and NSAIDs like aspirin, ibuprofen, or naproxen are commonly given for head injuries, but aspirin should be avoided in young people with viral infections to prevent Reye's syndrome.
Step-by-step explanation:
When someone has a head injury, painkillers are the medication commonly given. Painkillers such as acetaminophen (paracetamol) and NSAIDs like aspirin, ibuprofen, or naproxen can help reduce pain and inflammation associated with head injuries. However, it is important to note that aspirin should be avoided in young people with viral infections to prevent a rare condition called Reye's syndrome, which can cause swelling of the brain.