Sildenafil citrate is commonly found in fildena 100 mg tablet of as a common brand. Used to treat men suffering from erectile dysfunction. The effect of this medicine lasts for 4 to 6 hours and if you take fildena tablet 30 minutes to 1 hour before sexual intercourse, you can see the good effect of this medicine. This drug can be taken orally with water but do not take this drug with alcoholic beverages as it reduces the effect of the drug.