Filagra is a member of the phosphodiesterase type 5 inhibitor (PDE5 inhibitor) medication family. When you are sexually stimulated, it causes your penis' blood vessels to relax.

Because of this, blood can enter the penis and cause it to erect on its own.

Nitric oxide (NO) is released in the corpus cavernosum during sexual stimulation, which is one of the physiological processes that causes penile erection.

Subsequently, NO triggers the guanylate cyclase enzyme, which increases cyclic guanosine monophosphate (cGMP) levels, resulting in blood loss and smooth muscle relaxation in the corpus cavernosum.

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