Fildena is a generic mainly used in the treatment of Erectile Dysfunction and other sexual complaints in males. Physically it is a little red coloured triangle tablet and chemically contains of Sildenafil which is the main constituent of the blockbuster drug Viagra. The mechanism of Fildena is also the same fildena vs Viagra, where the drug increases the blood flow to the penile area. This causes an erection of the penis which can be sustained for the normal time of sexual intercourse. The drug is known for providing quick action. Fildena contains Sildenafil citrate which is a PDE5 inhibitor; it prevents the breakdown of cGMP which is responsible for the constriction of smooth muscles. As a result, the blood vessels are in a relaxed state. The muscles are also in a relaxed state. This allows more blood to be taken into the penis and hence produces an erection. In order to achieve a sustained erection, proper sexual stimulation is necessary before the intercourse. This is further aided by the nitric oxide produced in the penile region. Fildena 150mg is considered to be a higher dose used in the treatment of ED. They are not usually prescribed in the initial stages of therapy.