Need a Chill Pill? Here's a Recipe from the 19th Century

In the 1980s and early 1990s, if you were acting uncool, your sassy friend might have told you to “take a chill pill”–that is, to relax. But in the late 1800s, if someone told you to take a chill pill, they'd mean something completely different: a literal pill meant to cure the actual chills. How did the phrase “chill pill” go from medical terminology to retro rhyming slang?
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