The active ingredient named sildenafil citrate is included in the kamagra tablet. Used to treat men suffering from erectile dysfunction. The effect lasts for 4 to 6 hours. And if the effect of kamagra 100 lasts for more than 4 hours, seek the help of a doctor immediately. If you want to take this medicine with another dose, take it after 1 day. Do not take this medicine orally with a glass of water but with alcoholic beverages. Because it reduces the effect of the drug.