- Fildena 100mg drug is considered as a brand name dysfunction of Sildenafil and is mainly used to treat erectile dysfunction in men. This is also very beneficial for impotent men. It is a universal form of Viagra. Each medicine contains 100mg of sildenafil citrate. This is also known as Fildena 120 purple. But before taking this drug, people should consult a doctor. This means that they should not take this medicine unless the doctor prescribes it. Patients should talk to a doctor if they have any problems. Fildena 120 treats erectile dysfunction by increasing blood flow to the male s*x organ, the penis, upon physical stimulation. This improved blood flow is the reason for the erection. Sildenafil cures PAH by narrowing blood vessels in the lungs, allowing blood to flow smoothly. Fildena 120 is a phosphodiesterase-5 inhibitor.