In 2003, two inhibitors of phosphodiesterase 5 (PDE5) — tadalafil (Cialis; Lilly ICOS) and vardenafil hydrochloride (Levitra; Bayer/ GlaxoSmithKline) — were approved by the US FDA for the treatment of erectile dysfunction. Can they challenge the dominance of the first PDE5 inhibitor, sildenafil citrate (Viagra; Pfizer), which rapidly became a blockbuster following its market entry in the late 1990s?
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