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How confident are you that the drugs you take, whether they’re over-the-counter or prescription, are totally understood by the companies who make them? Drug makers know what their products do when they enter your body, right?

You shouldn’t assume that.

Even drugs like acetaminophen have a mostly secret life once they’re inside of us. That has to do with our mysteriously complex biology and something called the “mechanism of action.”


In this episode of Signal, we talk everything from Tylenol to fen-phen to Viagra and why you should probably think hard before you take any drug at all.

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The Signal podcast is produced by Katie Hiler.