Kamagra 100 mg refers to the 100mg dosage of Kamagra, which contains sildenafil citrate, the same active ingredient. It's primarily used to treat erectile dysfunction (ED) in men by improving blood flow to the penis, helping to achieve and maintain an erection when sexually aroused. Kamagra 100 is commonly available in tablet form, but it may also be found in oral jelly or chewable forms. Typically taken about 30 minutes to 1 hour before sexual activity. The effects can last for 4-6 hours, but this can vary between individuals.