Which medication became the world's first 'blockbuster' prescription drug, reaching $1 billion in annual sales in 1988 and revolutionizing pharmaceutical marketing?

The pharmaceutical industry has created numerous blockbuster drugs that have revolutionized medicine and generated billions in revenue. These products have shaped healthcare markets and company fortunes. This poll tests your knowledge about a pivotal moment in pharmaceutical market history - the first medication to achieve the coveted 'blockbuster' status (annual sales exceeding $1 billion), fundamentally changing consumer behavior and market research in the pharmaceutical sector.

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Tagamet (cimetidine) - SmithKline & French's ulcer medication
Prozac (fluoxetine) - Eli Lilly's antidepressant
Zantac (ranitidine) - Glaxo's heartburn and ulcer medication
Valium (diazepam) - Hoffmann-La Roche's anxiety medication