Filitra 10 mg typically contains vardenafil, a medicine used to treat erectile dysfunction (ED). Most people do not need to contact a doctor after taking it if they feel well and have no concerning symptoms. When should you contact a doctor after taking Filitra 10 mg? Immediately — seek emergency care: chest pain, fainting, severe difficulty breathing, or a severe allergic reaction with swelling of the face or throat. If you have chest pain, tell emergency staff you took vardenafil; do not take nitrate medicines yourself. Immediately — urgent medical care: an erection lasting 4 hours or longer, even if it is not painful. Immediately contact a doctor: sudden loss or change of vision, sudden hearing loss, or severe dizziness. Contact your doctor if symptoms persist or worsen: headache, flushing, indigestion, or nasal congestion that is severe or does not go away. Mild symptoms can occur and often settle within a few hours.