The main purpose of Kamagra 100 is to help men with erectile dysfunction achieve and sustain an erection during sexual stimulation. Sildenafil helps relax the blood vessels in the penis, allowing increased blood flow, which is essential for achieving an erection. Kamagra 100 generally starts working within 30 to 60 minutes after ingestion, although it can vary depending on factors like food intake and individual response. The medication typically stays effective for about 4 to 6 hours, allowing for flexibility in timing sexual activity.