Fildena 25 is a well-known prescription medicine viagra, that is used to deal with Erectile Dysfunction. It carries the lively element sildenafil citrate. Sildenafil citrate works by means of blocking an enzyme known as phosphodiesterase type five (PDE5).  PDE5 breaks down a chemical called cGMP, that's responsible for enjoying the blood vessels inside the penis.  Whilst PDE5 is...