Kamagra may be the answer to the sex problem that you have. This drug used to treat erectile dysfunction goes under the generic name Sildenafil. The function of this drug, first approved by the Indian Food and Drug Administration, is to inhibit the FDE5 from constricting the blood vessel through which blood flows to the penis. If you don’t know, what causes the erection of the penis is the surge of blood that’s caused by arousal, as communicated by the brain.