The main purpose of Sildenfail is to treat erectile dysfunction (also called sexual impotence).
Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors.
These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly.
Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation.
This increased blood flow can cause an erection.
Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily.
Both brand name Viagra and its generic version sildenafil work by increasing blood flow to your penis.
The corpora cavernosa — a pair of sponge-like areas of tissue inside your penis — relax, letting blood flow freely into the penis.
This blood fills the tissue and causes your penis to expand and harden.