Fildena 50 mg can be safe for many men when taken as directed by a healthcare professional, but it isn't safe for everyone. It is marketed as containing sildenafil 50 mg, a medicine used to treat erectile dysfunction (ED). What you should know Effectiveness: Helps increase blood flow to the ***** during ***** stimulation. Common side effects: Headache, facial flushing, indigestion, nasal congestion, and dizziness. Major interaction: Never take sildenafil with nitrate medicines such as nitroglycerin or isosorbide, or recreational poppers, because blood pressure can drop dangerously. Medical conditions: Consult your doctor first if you have heart disease, low blood pressure, significant liver or kidney problems, or take medicines for blood pressure. Dosage: Do not take more than one dose in 24 hours for erectile dysfunction unless a clinician specifically directs otherwise. Seek emergency care for chest pain, sudden vision or hearing loss, difficulty breathing, or an erection lasting more than four hours. One important distinction: These safety considerations apply to sildenafil generally. The authenticity and regulatory approval of the specific Fildena product should be verified.