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How do pain killers work?

I am the kind of person that pops a painkiller at the first twinge of an ache or a pain.  I am also the kind of person that wonders why you always have to take TWO.  Why can't they just make the tablet doubly as strong so that you only have to swallow one? But then again I am also the kind of person that has absolutely no idea of how medicine works which is why I was thrilled to find this easy to understand video.

Watch and learn

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