Fildena 150 mg is used to treat ED problems in men. This medicine contains an ingredient called Sildenafil, which works by increasing the blood flow in the penile arteries to relax the muscles. This medicine can be taken 1 hour before sexual activity to strengthen the erection. This medicine should be taken with water. The effect of this medicine lasts for about 36 hours. The effect of this medicine varies from person to person in about 30-40 minutes. This medicine is recommended only for men aged 18 and above.