Which revolutionary packaging innovation was introduced in the 1980s that significantly improved medication adherence and is now used for over 40% of prescribed oral solid medications worldwide?

Packaging plays a critical role in the medical industry, ensuring product sterility, extending shelf life, and providing essential information to healthcare providers. Throughout history, several breakthrough packaging innovations have revolutionized medicine delivery and safety. This trivia question focuses on a significant packaging innovation that changed how a common medical product is delivered and used worldwide.

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Blister packs (unit-dose packaging)
Child-resistant safety caps
Tamper-evident seals
RFID-enabled smart packaging