Avana 100 mg is a medication used to treat erectile dysfunction (ED). It contains avanafil, a phosphodiesterase type 5 (PDE5) inhibitor, similar to sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra). Do not take more than one dose in a 24-hour period. Your healthcare provider might adjust the dose based on effectiveness and tolerance, with possible lower or higher doses.