Fildena 100 mg is very useful in treating men with low erections. The drug contains an active ingredient called sildenafil, which works to increase blood flow in the penile arteries. This medicine is used 1 hour before intercourse to stabilize the penis during intercourse so that you can get a satisfactory erection. The effect of this medicine lasts for about 3 to 4 hours. Alcohol should not be consumed while taking this medicine. This medicine is recommended only for men aged 18 or older. Cold drinks or alcohol should not be consumed while taking this medicine as it slows down the effect of the medicine.