New discovery: Tylenol stops pain at the nerves, before it hits the brain

Acetaminophen may be doing more than just dulling pain in your brain it could be stopping it before it even starts. Scientists at Hebrew University have discovered that a metabolite of the drug, AM404, blocks pain signals right at their source by shutting down specific sodium channels in pain-sensing nerves. This radically shifts our understanding of how this common medication works and opens a door to new, more targeted painkillers that might eliminate side effects like numbness or weakness.