Question

How do Painkillers Work?

Answer 1

When part of your body is injured, special nerve endings send pain messages back to your brain. Painkilling drugs interfere with these messages, either at the site of the injury, in the spinal cord or in the brain itself. Many painkillers are based on one of two naturally occurring drugs: aspirin and opiates.

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Answer 2

pain killer means a medicine which kills pain

hence they work by reducing a pain in a particular region...