Avanafil is a medication 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. Avanafil belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. This medication is typically taken about 15 to 30 minutes before sexual activity and can last for up to six hours. Common side effects may include headaches, flushing, and nasal congestion. It is important to consult a healthcare provider before using Avanafil, especially for those with underlying health conditions or who are taking other medications.