Male erectile dysfunction (ED) is treated using the medication kamagra online. It contains active ingredients, such as sildenafil citrate, which combine to enhance erotic performance. While sildenafil is a selective serotonin reuptake inhibitor (SSRI) that helps to extend the duration of sexual arousal, sildenafil citrate is an inhibitor of phosphodiesterase type 5 (PDE5), which improves blood flow to the penis.