Fildena Professional is marketed as a medicine for erectile dysfunction (ED), a condition in which a man has difficulty getting or maintaining an erection. It is commonly sold as a product containing sildenafil citrate, the same active ingredient used in Viagra. Check the packaging to confirm the ingredient and strength of your specific product. Purpose: Helps improve blood flow to the penis during Fildena Professional stimulation. Onset: Sildenafil often starts working within 30–60 minutes. Duration: Its effects may last around 4–6 hours. Important: It does not increase sexual desire directly, and sexual stimulation is still needed. Is it safe? Fildena Professional should be used with medical guidance, particularly if you have heart disease or take blood-pressure medicines. Never combine it with nitrates such as nitroglycerin or isosorbide; this can cause a dangerous drop in blood pressure. Do not combine it with other ED medicines such as Cenforce, Malegra, Vilitra, or Vidalista without medical advice. Seek emergency care for an erection lasting more than four hours, sudden vision or hearing loss, or chest pain. One important distinction: A product being marketed as a medicine does not guarantee that a particular pack is genuine or quality-assured.