Kamagra is designed to restore potency and treat erectile dysfunction in men as well as to prolong the duration of sexual intercourse for more than 20 minutes. The tablet’s active ingredient sildenafil is a phosphodiesterase5 enzyme (PDE5) inhibitor. Sildenafil stops the activity of the PDE5 enzyme, while at the same time promoting increased blood flow to the penis to create a firm erection when the user is sexually stimulated.