Kamagra 100 is the most current, strongest, and most commonly used treatment for sexual problems in men, such as erectile dysfunction or impotence. The active ingredient in this drug, sildenafil citrate, slowly relaxes the blood vessels in the penis of men and increases blood flow. So that sexual activity can be enjoyed for a long time with a strong erection during sexual activity. This drug is usually 30-40 effective and lasts for about 5-7 hours.