Men with erectile dysfunction (ED) can be treated with the drug Fildena 50. The active component of it is sildenafil citrate. Typically, Fildena 50 mg is taken orally along with a glass of water. It is usually advised to take the drug between 30 and 1 hour prior to any scheduled sexual activity. If you take the drug empty-handed, it might function better. An erection can be induced in a man in response to sexual stimulation for a duration of 4 to 6 hours when Fildena 50 mg is effective.