Hamdard Viagra Bangladesh is a herbal medicine that is used to treat erectile dysfunction and other sexual problems in men. The active ingredient in this medicine is sildenafil, which is also the active ingredient in Viagra. This medicine works by increasing blood flow to the penis, which helps to achieve and maintain an erection. Hamdard Viagra Bangladesh is available in tablet form and should be taken orally with water. It can take up to one hour for this medicine to take effect and it typically lasts for four hours.