Vardenafil for the treatment of impotence can be used before sexual intercourse and generally does not need to be taken every day; however, it does need to be taken every day if prescribed by a doctor. Vardenafil is used to treat erectile dysfunction in the male penis, and generally patients can take it before 25-60 minutes before sexual intercourse, and do not need to take it every day. However, if the patient is impotent, the doctor clearly need to take every day, it is recommended to follow the doctor’s advice to take according to the course of treatment, do not change the dosage of the drug, so as to avoid the drug does not achieve the therapeutic effect. The drug may have headache, facial flushing, dyspepsia, dizziness, nausea and other adverse reactions after use, usually transient, if the adverse reactions are serious, should immediately seek medical treatment. Patients who are allergic to the drug are prohibited from using it. It is recommended that patients with impotence seek medical treatment standardized treatment, do not blindly self-medication, so as not to cause discomfort.