Fildena chewable 100mg tablet contains sildenafil citrate as the active agent used for the treatment of erectile dysfunction and pulmonary hypertension. You can buy this drug by prescription from any of the major online pharmacies, pharmacies and medical supply stores by prescription only. Sildenafil Citrate is the main ingredient present in Fildena Chewable Tablet 100mg, which is available in other substitutes as well as with different strengths at all major online pharmacies, pharmacies and medical supply stores. Fildena XXX 100mg Sildenafil citrate is a phosphodiesterase (PDE-5) is an active ingredient in Fildena chewable 100mg tablet which basically works on erectile dysfunction by increasing blood flow to the p*nis by relaxing p*nile muscles in men. Sildenafil citrate also works in pulmonary hypertension by relaxing the blood vessels in the lungs to allow blood to flow more easily.