The Legacy Drug: What Sustained Revenue Reveals About Brand Loyalty
Sildenafil citrate, the active ingredient in Viagra, holds a unique and enduring position in the erectile dysfunction market. Despite facing intense generic competition following patent expirations over the past decade, the sildenafil segment continues to command the largest slice of the revenue pie, estimated at over $\$$1.5$ billion and retaining approximately $45\%$ to $57\%$ of the total...
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