Which pharmaceutical product's 1997 marketing campaign featuring a senior couple walking on a beach is credited with revolutionizing direct-to-consumer drug advertising in the US?

In the competitive world of medical marketing, some campaigns make history by changing public perception and revolutionizing how healthcare products are promoted. This question focuses on a groundbreaking pharmaceutical marketing campaign that transformed direct-to-consumer advertising in the medical industry. Test your knowledge of this pivotal moment in medical marketing history!

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Viagra (Pfizer)
Claritin (Schering-Plough)
Prozac (Eli Lilly)
Viagra (Pfizer)