Which of these medications was originally developed as a treatment for hypertension but became a blockbuster drug after discovering its unexpected side effect?

The pharmaceutical industry has seen remarkable product development stories, where medications initially designed for one purpose found unexpected success in entirely different applications. These serendipitous discoveries have revolutionized treatment options and created billion-dollar market opportunities. Test your knowledge of these famous medical product pivots that changed the industry landscape and improved countless lives.

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Sildenafil (Viagra) - originally for angina/hypertension, became treatment for erectile dysfunction
Minoxidil (Rogaine) - originally for ulcers, became treatment for hair loss
Botulinum toxin (Botox) - originally for muscle spasms, became cosmetic treatment
Thalidomide - originally for morning sickness, became treatment for multiple myeloma