Fildena 100 purple pill is a medication used to treat erectile dysfunction and contains sildenafil citrate, the same active ingredient found in Viagra. It is often described as a purple pill and is known for helping men achieve and maintain an erection when sexually aroused. Usually takes about 30 minutes to an hour before sexual activity. The effects can last for 4 to 6 hours. It's important to talk to a healthcare provider before using it, especially if you have any underlying health conditions or are taking other medications.