Vardenafil is a medication primarily used to treat erectile dysfunction (ED) in men. It works by increasing blood flow to the penis, helping to achieve and maintain an erection when sexually stimulated. Vardenafil belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. This medication is typically taken orally, about 30 to 60 minutes before sexual activity. It can remain effective for up to 6 hours, allowing for more spontaneity in intimate situations. Common side effects may include headaches, flushing, and nasal congestion, but serious side effects are rare.