Hialeah is the trade name of tadalafil and Viagra is the trade name of sildenafil, there is no such thing as which one is the safest, they all belong to the same class of drugs. Tadalafil and sildenafil are both clinically used in the treatment of male penile erectile dysfunction, the two drugs are the same class of products, are selective type 5 phosphodiesterase inhibitors, the difference is not very big, choose one of them can be. Common adverse reactions to this class of drugs are gastrointestinal irritation, dizziness and headache, flushing, and increased heart rate. This class of drugs is contraindicated in people who are allergic to any of the ingredients in this product, who are taking any form of nitrates, women, children and other people. If you have erectile dysfunction, you should go to the hospital for further examination, and the drug should be used under the guidance of a specialized doctor.