Vilitra 20 can lead to an overdose. Common signs include severe headache, dizziness, and flushing (redness and warmth in the face and neck). You may also experience severe stomach pain, nausea, vomiting, or diarrhea. A dangerous drop in blood pressure can cause fainting, weakness, or lightheadedness, especially if you are standing up quickly. Heart-related symptoms such as rapid or irregular heartbeat, chest pain, or shortness of breath may occur, and these require immediate emergency care. Vision changes, such as blurred vision, sensitivity to light, or seeing a blue tint, can also be a warning sign. Some people may experience sudden hearing loss or ringing in the ears. One of the most serious signs of overdose is a painful erection lasting more than 4 hours (priapism). This is a medical emergency and can cause permanent damage if not treated quickly. If any of these symptoms appear after taking Vilitra 20, seek medical help immediately or call emergency services.