<unk>  inhibits phosphodiesterase-5 inhibitor, preventing the degradation of cGMP. The increased levels of cGMP causes vasodilation, resulting in an increased blood flow in the penis.<unk> 's mechanism of action takes places once nitric oxide is released, in association with sexual stimulation.
Avanafil
Udenafil
Vardenafil
Tadalafil
Telmisartan
Sildenafil
Mesterolone
Norpipanone