Fildena 100 purple pill is a medicine used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, which helps increase blood flow to the penis, taking into consideration firmer erections. It is prescribed to talk with a specialist before taking Fildena 100, as it can interact with different meds and cause side effects. Fildena 100 mg comes in tablet form and is required 30 to 60 minutes before sexual activity. It should not be more than once a day. There are alternative medications available for ED, and the cost of Fildena 100mg can vary depending upon the source.