Fildena is the most used and the most effective treatment for treating erectile dysfunction in men. Fildena helps to keep you erections for a long time on a bed. Fildena 100 purple is the most used dose before Fildena 150mg dose. Fildena 100 comes with a purple color. So, it is also known as Fildena 100mg purple viagra pill. Fildena is the medication of the active ingredient Sildenafil Citrate.