Zudena pills are a medication primarily used to treat erectile dysfunction (ED) in men. It contains the active ingredient udenafil, which is a type of phosphodiesterase type 5 (PDE5) inhibitor. Like other PDE5 inhibitors, Zudena pills are generally considered safe when used as prescribed, though it is important to consult a healthcare provider before using them. Potential side effects include headaches, flushing, or dizziness, which are common with many ED medications. It’s also essential to avoid combining Zudena pills with certain medications, particularly nitrates, as this can cause a dangerous drop in blood pressure.