ED is commonly called impotence. It is a condition in which a man can't achieve or maintain an erection during sexual performance. Symptoms may also include reduced sexual desire or libido. These kinds of issues can happen at any time and to any man. Causes mainly include fatigue , stres. Standard treatments for ED include lifestyle changes, such as: Exercising, losing weight, stopping smoking, curbing alcohol intake. Medications like Viagra, Cialis, or Levitra increase blood flow to the penis. But they can also cause side effects, including: nasal congestion, headache, upset stomach, vision changes, facial flushing, and dizziness. Testosterone replacement and erection-inducing injections are also available.