Fildena 100 purple pill is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, the same active ingredient found in Viagra, which helps increase blood flow to the penis, enabling a firmer and longer-lasting erection when sexually aroused. Fildena 100 mg typically starts working within 30 to 60 minutes after intake and can last for up to 4 to 6 hours.