Viagra (sildenafil citrate) is used to treat erectile dysfunction. This condition prevents men from obtaining erections even when they are sexually aroused and psychologically ready for sexual intercourse. Make sure your health care provider knows about any conditions you have or used to have. This will allow your health care provider to prescribe the right dosage and make sure you benefit from the treatment. Let your doctor know if you have blood circulation problems, heart attack, multiple myeloma, bleeding disorder, diabetes, chest pain, blood cell problems, kidney or liver disease, irregular heartbeat, leukemia, conditions affecting the shape of the penis, high cholesterol, or any other health conditions that you think are of importance.

People with pre-existing heart problems should very careful with taking Viagra as in some cases such patients report stroke, high blood pressure, irregular heartbeat, heart attack and even some cases of sudden death. Sudden vision loss is another serious symptom often associated with taking Viagra. In some cases this health effect can be permanent while in other cases if timely assistance is given can be reversed. People with pre-existing eye problems, smokers, as well as those diagnosed with high blood pressure, high cholesterol and people older than 50 are more likely to develop sudden vision loss that other patients.