Which pioneering medical product was initially marketed as a 'headache medicine' before becoming one of the world's best-selling drugs for heart attack prevention?

The pharmaceutical and medical device industries have brought numerous revolutionary products to market that have changed healthcare forever. These innovations often follow fascinating paths from discovery to widespread adoption, involving unique marketing strategies, consumer psychology, and retail distribution challenges. Test your knowledge about a famous medical product that transformed patient care and created new retail healthcare paradigms.

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Aspirin (acetylsalicylic acid)
Lipitor (atorvastatin)
Tylenol (acetaminophen)
Advil (ibuprofen)