Viagra (sildenafil citrate) is a medicine that can be prescribed for the treatment of male impotence, especially if the patient using it is unable to perform sexually. This drug works by increasing the blood flow to the tissues of the penis therefore making it possible for you to enjoy all the benefits of the treatment. You will need to take the right dose of Viagra to benefit from the treatment as much as possible. Your health care provider or online doctor will be able to advise you on the dose you will need. This will be decided based on a number of aspects you will need to report. Make sure you tell your health care provider if you have leukemia, physical deformity of the penis, a recent history of a heart attack or stroke, high or low blood pressure, sickle cell anemia, multiple myeloma, hemophilia, kidney disease, stomach ulcer, condition of the eye, liver disease, congestive heart failure, coronary artery disease, heart rhythm problems, or any other health issues that may need to be discussed, as they can affect your dose. If you are not sure about anything, it's always best to learn this information from a reliable source instead of doing something based on you own assumptions.