Fildena 100 Purple Pills is a treatment for impotence and erectile dysfunction in men. This medication is only available to men who are at least eighteen years old. Take this medication no more than 30 minutes before having sex. One ingredient in this drug, sildenafil, helps to increase blood flow to men's penile tissue. You can take this medication with or without food. Do not chew or crush the tablet; instead, take it with water. Adhere to your doctor's instructions when using this medication. This medication will not work as well if you take it with cold or fatty foods. It takes 24 hours for this medication to start working.