The side effects of Vilitra are officially listed in several reliable sources: Patient Information Leaflet (PIL) / Package Insert Every Vilitra package includes a leaflet detailing possible side effects, dosage instructions, and precautions. This is the most authoritative source provided by the manufacturer. Official Pharmaceutical Website / Manufacturer The company that manufactures Vilitra (usually Centurion Laboratories or other licensed manufacturers) provides information about common and rare side effects, contraindications, and warnings. Regulatory and Medical Databases Sources like Drugs.com, MedlinePlus, or the European Medicines Agency (EMA) database list side effects reported in clinical trials and post-marketing surveillance. Healthcare Professionals Doctors and pharmacists can provide detailed explanations of possible side effects, severity, and how to manage them. Common Side Effects of Vilitra (Tadalafil-based) Headache Flushing (redness of face or neck) Dizziness or lightheadedness Stomach upset or indigestion Nasal congestion or back pain Serious side effects (rare) include: Prolonged erections (>4 hours) Vision or hearing changes Severe chest pain or irregular heartbeat For safety, always read the official leaflet included with your Vilitra pack before taking it.