Viagra 200mg is the best and effective medicine for the treatment of Erectile Dysfunction (ED) in men. It is the highest dose of medicine which is given to patients for whom the lower doses do not work properly. It contains the active ingredient Sildenafil Citrate which helps the blood to flow properly through the penis, thereby giving you an erection within 30 minutes. A person can stay hard for as long as 8 hours and spend a good time with his partner in bed. For best results, take this medicine 1 hour before any sexual activity.