Some people may also have ringing in their ears tinnitus or dizziness. If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. Cardiovascular disease: One of the earliest signs of heart disease is the inability of blood vessels in the penis to enlarge, allowing enough blood flow to get and maintain an erection. Sildenafil Liqrev, Revatio is used to improve the ability to exercise in adults Liqrev, Revatio and children 1 year of age and older Revatio with pulmonary arterial hypertension PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness. This condition may require prompt medical treatment to prevent serious and permanent damage to your penis. Side Effects Along with its needed effects, a medicine may cause some unwanted effects.Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision. Erectile dysfunction is when a man has difficulty getting an erection or keeping it long enough for sex. It’s also known as ED or impotence. It happens when not enough blood flows to the penis, preventing an erection. The frequency increases with age, affecting about 50% of men over age 40*; however younger men may also experience ED. Still, if your doctor says it’s okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price-comparison site test1.ru