Pharmacotherapeutic group Drug used for erectile dysfunction Pharmacological action Drug used for erectile dysfunction. Selective inhibitor of cGMP-specific phosphodiesterase type 5 (PDE 5), which is responsible for the breakdown of cGMP in the cavernous body of the penis. Actively enhances the relaxing effect of nitric oxide (NO) on the smooth muscles of the cavernous body and increases blood flow in the penis. When the NO-cGMP chain is activated, which is observed during sexual arousal, the inhibition of PDE 5 leads to an increase in cGMP in the cavernous body. The pharmacological effect is achieved only in the presence of sexual stimulation. Product facts: Form: Capsules; Dosage: 100mg; Pack size: 100mg.