Red Bull is a functional drink that does not have the therapeutic benefits of a drug; Viagra, also known as sildenafil, is mainly used to treat erectile dysfunction. Red Bull does not have a therapeutic effect, but can only supplement the role of the nutrients contained. Sildenafil is a commonly used medication for the treatment of erectile dysfunction. If you have erectile dysfunction, you can choose and use it under the guidance of your doctor. Adverse reactions include dizziness and headache, increased heart rate and flushing. It is forbidden to use it for those who are allergic to the drug, as well as those who take nitrate drugs, women, children and other people. The body should consult a doctor in time if there are uncomfortable symptoms, and all drugs should be used under the guidance of a professional doctor to avoid abusing drugs by yourself.