Filitra, which is commonly marketed as containing vardenafil for erectile dysfunction (ED), asking your doctor the right questions can help you understand whether it's safe and suitable for you. Questions to ask your doctor Is Filitra suitable for me? Consider your heart health, blood pressure, liver and kidney function, and medical history. What dose should I use? Ask whether 5 mg, 10 mg, or 20 mg is appropriate for you. Could it interact with my other medicines? Mention all prescription medicines, supplements, and over-the-counter products you take. What side effects should I watch for? Ask about headaches, flushing, indigestion, dizziness, and vision changes. How quickly does it work, and how long do its effects last? What should I do if it doesn't work? Ask before increasing the dose or switching to another ED medicine. Is the specific Filitra product I have properly approved and authentic? Are there safer alternatives for my situation? Important safety precautions Never combine vardenafil with nitrate medicines, such as nitroglycerin, or recreational nitrites known as poppers. Tell your doctor if you take alpha-blockers or medicines that affect heart rhythm. Seek emergency care for chest pain, sudden vision or hearing loss, or an erection lasting more than four hours.