kamagra pills  contain sildenafil as an active ingredient which is incidentally used to treat men suffering from erectile dysfunction and impotence problems similar to Viagra. So this drug is cheaper than Viagra so men prefer to take this drug. The effect of this drug lasts for 4-5 hours so you should not eat heavy food and do not consume alcohol while taking this drug. Although this medicine comes in different doses, it is important to consult your doctor while taking the medicine.