Erectile dysfunction is a name of condition when cGMP enzyme is replaced by another enzyme PDE5 (phosphodiesterase type-5). PDE5 enzyme breaks down cGMP and takes its place. Blood flow is restricted by PDE5 enzyme leading to causing erection problem in men. Blood is essential for erection achievement. Malegra inhibits PDE5 enzyme, enhancing blood flow to the penile area. Blood filled penile region makes it easier for men to achieve erection. Malegra also releases cGMP in the body as without it erection is impossible.