The generic brand name sildenafil citrate is found in kamagra oral jelly. Used for the treatment of men suffering from erectile dysfunction. The effect of this medicine lasts for 4 to 6 hours and if you take this medicine 30 minutes to 1 hour before sexual intercourse, you can see the good effect of kamagra tablet. 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.