Vardenafil 20 mg is a medication used to treat erectile dysfunction (ED) in men by improving blood flow to the penile tissues. It works by inhibiting the phosphodiesterase-5 (PDE-5) enzyme, which relaxes blood vessels and increases circulation during sexual stimulation, helping achieve and maintain a firm erection. Vardenafil is usually taken 30–60 minutes before sexual activity, and its effects may last for several hours. The 20 mg strength is considered a higher dose and may be prescribed when lower doses are not sufficiently effective. Possible side effects may include headache, flushing, nasal congestion, dizziness, and indigestion, and it should be used under proper medical supervision.