Which pharmaceutical product launch was considered revolutionary for being the first highly effective oral medication for treating erectile dysfunction?

The development of new medications involves complex clinical trials, regulatory approvals, and strategic product launches. Some pharmaceutical product launches have transformed entire therapeutic areas and changed medical practice forever. Test your knowledge of these groundbreaking moments in medical product history!

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Viagra (sildenafil), launched by Pfizer in 1998
Cialis (tadalafil), launched by Eli Lilly in 2003
Levitra (vardenafil), launched by Bayer in 2003
Stendra (avanafil), launched by Vivus in 2012