Filitra is a prescription medication used to treat erectile dysfunction (ED) in men. Its active ingredient is vardenafil, a PDE5 inhibitor that increases blood flow to the penis during sexual stimulation. This helps men achieve and maintain a firm, natural erection sufficient for sexual activity. Common side effects of Filitra may include headache, flushing, nasal congestion, dizziness, and indigestion. In rare cases, it can cause serious side effects like vision or hearing loss, or priapism (a prolonged erection), which requires immediate medical attention.