Sildenafil is the first internationally approved drug for erectile dysfunction. Unsupervised and non-prescribed use of sildenafil among young Indian population has increased in last few years. Sildenafil helps in erection of penis by inhibiting the action of Phosphodiesterase-5 (PDE-5) enzyme, present in the vasculature of corpus cavernosum muscle and lengthens the duration of erection.
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