Erectile dysfunction (impotence) is the inability of a man's penis to become erect during intercourse. The main cause of this problem is the insufficient blood supply to the male penis. There is a very good medicine available for this and that is kamagra gold 100. Sildenafil citrate is the main ingredient in this medicine which helps a lot in curing this problem. Taking this pill improves the blood flow in the penis of men. This gives them a hard erection during sex and this allows the couple to enjoy sex for a longer period of time. This pill should be taken 30-40 minutes before sex. The effect of this medicine lasts for 6 hours. An overdose of this medicine causes side effects. This medicine is not for children and women, but only for men aged 18 years and above. Also, while taking this pill, alcohol, high-fat foods, and beverages should be avoided as this will reduce the effect of the pill.