Which pharmaceutical company pioneered the first direct-to-consumer (DTC) television advertisement for a prescription medication in the United States?

In the competitive pharmaceutical industry, marketing campaigns can significantly impact a medication's success and public perception. Some campaigns have been groundbreaking in their approach, creating lasting brand recognition and changing how medical products are marketed to both healthcare professionals and patients. Test your knowledge of notable pharmaceutical marketing innovations that shaped the industry.

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Pfizer for Viagra (sildenafil)
Eli Lilly for Prozac (fluoxetine)
Merck for Singulair (montelukast)
Schering-Plough for Claritin (loratadine)