Phosphodiesterase 5 receptor (PDE5) inhibitors similarities and differences: a non-prescription medicine perspective
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Introduction Phosphodiesterase 5 receptor (PDE5) inhibitors have had a significant impact on the treatment of erectile dysfunction (ED), with the introduction of drugs like sildenafil citrate (Viagra®), tadalafil (Cialis®), and vardenafil (Levitra®). In 1998, Pfizer launched the first PDE…
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