Kamagra Oral Jelly Australia is a medicine that doctors give to men with erectile dysfunction (also called impotence) to help them get and keep an erection. Its active ingredient, sildenafil citrate, is a phosphodiesterase type 5 (PDE-5) inhibitor that widens blood vessels. Sildenafil makes the blood flow faster to the penis, which helps you get and keep a firm erection. This medicine works for about 4 to 5 hours.