Kamagra 100 mg is one of the best known generics of Viagra. With the help of active ingredient Sildenafil erectile dysfunction can be managed very well. The sexual act becomes satisfying and successful. Erectile dysfunction is the inability to achieve or maintain an erection long enough to perform sexual intercourse. It relaxes the blood vessels in the penis, allowing more blood to enter to achieve an erection. It can also be used in pulmonary arterial hypertension