Vardenafil is mainly used for the treatment of penile erectile dysfunction, which can cause side effects such as headache, dizziness and flushing, and is contraindicated in patients who are allergic to the product. Vardenafil is a type 5 phosphodiesterase inhibitor, can effectively improve the quality and duration of erection, to be used to treat penile erectile dysfunction and improve the success rate of sexual life. Taking vardenafil may cause side effects such as headache, dizziness, facial flushing and indigestion. Contraindications to vardenafil are mainly allergy, so it is contraindicated in patients who are allergic to the product, taking nitrate or nitric oxide donor therapy at the same time, severe hepatic impairment, end-stage renal disease requiring dialysis, hypotension (blood pressure < 90/50 mmHg), history of recent strokes or infarcts (in 6 months), unstable angina pectoris, and familial degenerative eye diseases such as retinitis pigmentosa are also contraindicated. Please follow your doctor's instructions.