Filitra 40 mg, which contains vardenafil, another medication for erectile dysfunction (ED): Who should stop using Filitra 40 mg immediately People taking nitrates If you are on nitroglycerin, isosorbide mononitrate, or similar nitrate medications for heart problems, you must not take Filitra. Combining them can cause a dangerous drop in blood pressure, which can be life-threatening. People with severe heart conditions Those who have had recent heart attack, stroke, or life-threatening arrhythmias. People with unstable angina or severe heart failure. Severe liver or kidney problems Filitra is processed by the liver and kidneys. Severe impairment can increase the risk of side effects. Known allergy to vardenafil or any component of Filitra Symptoms like rash, swelling, or difficulty breathing require immediate discontinuation. Vision problems related to retinal disorders Those with retinitis pigmentosa or a history of sudden vision loss (NAION) should stop and consult a doctor. Priapism history Men who have painful erections lasting more than 4 hours should avoid ED medications until cleared by a physician. Red flags after taking Filitra: Chest pain, dizziness, fainting, sudden vision or hearing loss, or an erection lasting >4 hours. Seek emergency care immediately. If you want, I can create a simple checklist of Filitra 40 mg “stop immediately” signs for quick reference—it’s very practical for safety.