Do you know what is Kamagra ? So let's find out. By boosting blood flow to the penis, Kamagra helps men get and keep a hard erection during sexual stimulation. The relatively quick start of action of Kamagra is one of its main benefits. It works for up to four hours and is usually taken 30 minutes to an hour before sexual activity. Prescription of this medication prior to scheduled activity can assist men with ED in maintaining an erection strong enough for sexual engagement. This medication should be taken 30 to 60 minutes before engaging in any sexual activity. When using this jelly, stay away from grapefruit juice and alcohol as they may interact with the sildenafil citrate and raise the possibility of negative side effects.