Fildena, which contains sildenafil (the active ingredient in Viagra), is used to treat erectile dysfunction. For men with heart disease, it should be used cautiously and only under medical supervision. Fildena works by relaxing blood vessels, which can lower blood pressure. For individuals with heart conditions, especially those taking nitrates or medications for heart problems, this can cause dangerous drops in blood pressure. It is crucial to consult a doctor before using Fildena to ensure it's safe based on individual health status and medications. In some cases, alternative treatments may be recommended to avoid complications.