Sildenafil Citrate is a phosphodiesterase (PDE-5) that is an active ingredient in Filagra Double 200 mg tablet which basically works in erectile dysfunction by increasing blood flow to the penis by relaxing the muscle in penile blood vessels in men. Sildenafil Citrate also works in pulmonary hypertension by relaxing the blood vessels of the lungs to allow blood to flow more easily.

https://www.regularpills.com/product/filagra-double/