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Male Erectile Dysfunction (MED)

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Male Erectile Dysfunction (MED) is a common public health problem affecting millions of men worldwide. Phosphodiesterase 5 (PDE5) inhibitors are very attractive therapeutic agents for treatmentof MED [9]. Sildenafil (Viagra®, IC50 = 3 nM) is the first and most famous PDE 5 inhibitor, however, there are still some side effects due to the low selectivity against other PDEs, mainly towards PDE6 which is distributed in the retina, and inhibition of it may cause visual disturbances, perception of bluish haze, and increased light sensitivity [10]. In recent years, numerous efforts have been made toward the discovery of selective PDE 5 inhibitors. PDE 5 belongs to a superfamily of enzymes that catalyzes the hydrolysis of cyclic nucleotides cAMP and

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