Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus HIV. How can I best manage other health conditions with my erectile dysfunction? If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. Shake the liquid well for 10 seconds before each use to mix the medication evenly. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease PVOD; blockage of veins in the lungs ; a stomach ulcer; heart, kidney, or liver disease; a heart attack; heart failure; angina chest pain ; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems; blood cell problems such as sickle cell anemia a disease of the red blood cells , multiple myeloma cancer of the plasma cells , or leukemia cancer of the white blood cells ; conditions affecting the shape of the penis e.Ask Mayo Clinic: Erectile Dysfunction. From an accredited US hospital. Show transcript. . Drug Images. What is Viagra? Viagra is a brand-name prescription drug that’s . Below are details about Viagra dosages commonly used to treat erectile dysfunction .