Vardenafil is mainly used for the treatment of male penile erectile dysfunction. Vardenafil is used for the treatment of male erectile dysfunction, can efficiently and specifically bind PDE5, increase the release of local nitric oxide in the corpus cavernosum under the action of sexual stimulation to relax the smooth muscle, increase the blood flow in the corpus cavernosum of the penis to make the penis erect. It is usually taken 25-60 minutes before sexual intercourse. However, this type of drug may cause headache, dizziness and other adverse reactions, allergy and severe liver damage, low blood pressure and other patients are prohibited. In addition, the drug is generally not to be used by patients who suffer from severe cardiovascular dysfunction and other diseases that make sexual activity inappropriate. Due to the side effects and contraindications of the drug, please use the drug under the guidance of a physician and go to the hospital in time if you feel unwell.