Which groundbreaking cardiovascular medication's 1997 product launch included the first-ever direct-to-consumer TV advertising campaign for a prescription drug following the FDA's relaxation of broadcast advertising regulations?

The pharmaceutical industry has seen numerous groundbreaking product launches over the decades, transforming medical practice and patient outcomes. These launches often involve sophisticated marketing campaigns that must balance promotional effectiveness with regulatory compliance. This trivia question focuses on a particularly notable product launch that changed the landscape of cardiovascular medicine and represented a marketing watershed moment in the industry.

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Lipitor (atorvastatin)
Viagra (sildenafil)
Plavix (clopidogrel)
Norvasc (amlodipine)