What is Viagra 200 mg used for? Viagra 200 mg is a generic drug that circulates certain chemicals in the blood which provides energy and stamina to make it harder for you to get and keep an erection. Viagra 200 mg also known as sildenafil helps to relax muscles originating in the walls of blood vessels and boosts blood flow to specific areas of the body. In common, one Viagra 200 mg dose takes...