One of the main reasons Fildena 200 is effective in treating erectile dysfunction is because of its ability to promote the unwinding of smooth muscles. To get and maintain an erection, enlarged blood vessels and relaxed smooth muscle are essential components of erectile dysfunction treatment. When you are sexually excited, sildenafil causes your penis' blood vessels to relax, which allows blood to flow into your penis and results in an erection. Back pain, nausea, stuffy nose, headaches, blurred vision, and flushing in the face, neck, or chest are some of the side effects of fildena.