Fildena 150 tablet is a well-known brand of sildenafil citrate, a medication used to treat erectile dysfunction in men. Impotence, or erectile dysfunction, is a sexual condition in which a man is unable to achieve or maintain an erection during sexual activity. Fildena 150 mg tablet is a tablet that is taken by mouth. Take the recommended dose with a full glass of water and on an empty stomach if possible. The ability to digest the drug would be improved if the tablet is swallowed without food.