Which branded medication maintained over 70% market share for 5+ years after patent expiration, despite generic alternatives costing 80% less?

In the competitive pharmaceutical industry, building brand loyalty is crucial for long-term success. Even when generics become available, some pharmaceutical companies maintain remarkable customer loyalty through various strategies. This poll explores a fascinating case study of brand loyalty persistence in the medical industry that defied market expectations and demonstrated the power of effective brand management.

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Lipitor (atorvastatin) by Pfizer
Prozac (fluoxetine) by Eli Lilly
Nexium (esomeprazole) by AstraZeneca
Plavix (clopidogrel) by Sanofi/Bristol-Myers Squibb