How it works:
Viprogra Professional is a phosphodiesterase inhibitor. It is a selective inhibitor of cyclic guanosine monophosphate specific phosphodiesterase type 5 (PDE5) When the sexual stimulation causes local release of NO, inhibition of PDE5 by sildenafil causes incresaed loevel of cGMP in the corpus cavernosum resulting in smooth muscle relaxation and inflow of blood to the corpus cavernosum. It is also used for treating pulmonary arterial hypertension (PAH).