Sildenafil belongs to a group of drugs known as PDE5 inhibitors. Super Kamagra works by relaxing the blood vessels in the penis. This allows blood to flow into the penis when sexually aroused. Then erection occurs. This medicine will help you get an erection only if you are sexually aroused. It is very effective. But it needs to be taken at least 30 minutes before sexual activity. This drug works strongly for 3-4 hours.