Vilitra should be taken as directed by a healthcare professional, typically about an hour before physical activity. It is important to avoid excessive alcohol consumption, which can reduce its effectiveness and increase side effects such as dizziness or low blood pressure. Common side effects include headache, flushing, nasal congestion, upset stomach, and dizziness. Serious side effects, though rare, can include vision or hearing loss, chest pain, or prolonged erections lasting more than 4 hours (priapism), which require immediate medical attention.

https://www.genericday.com/vilitra.html