The class of phosphodiesterase type 5 inhibitors includes kamagra gel. This medication is used to treat erectile dysfunction in men. A man with erectile dysfunction sometimes referred to as impotence, is unable to sustain the hard-erected penis required for frequent sexual engagement. The constriction of the blood arteries supplying the penis is the reason for the decreased blood flow to the penis. It functions with an erection by boosting blood flow to the penis during sexual sensations. It should be taken as needed, approximately 30 to 60 minutes before sexual activity, and is intended for use by adult males.