We may finally know how Tylenol works — and it's not how we thought

According to a new study in rats, a key byproduct of acetaminophen, called AM404, may block pain at the source before it has a chance to reach the brain.

Jun 19, 2025 - 17:56
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We may finally know how Tylenol works — and it's not how we thought
According to a new study in rats, a key byproduct of acetaminophen, called AM404, may block pain at the source before it has a chance to reach the brain.