Fildena 150 mg that drug works in that treatment in sex. Sildenafil, the drug increases the function of the sex. That medicine is meant for men. Those who are not above 18 years of age can take the same medicine. Take this medicine 30 minutes before sexual activity. That drug works well in 4 hours of erection. If you are taking that medication and it is not working, visit your doctor. It becomes a serious problem. It is advised that the medicine is not for women or small children.