If you mean why Malegra works for erectile dysfunction, it is because Malegra products commonly contain sildenafil. Sildenafil is a PDE5 inhibitor. It helps relax blood vessels and increase blood flow to the penis during sexual stimulation, making it easier to achieve and maintain an  Malegra . It does not increase sexual desire and does not automatically cause an erection. The exact strength matters because Malegra is sold in different formulations. Sildenafil should not be combined with nitrate medicines, as this can cause a dangerous drop in blood pressure.