Fildena 100 mg, like other medications, can have potential side effects. Common ones include headaches, dizziness, flushing, nasal congestion, and indigestion. Some individuals may experience visual disturbances such as blurred vision or colour changes. In rare cases, more severe side effects like priapism (prolonged erection) or sudden vision or hearing loss can occur. It's crucial to consult a healthcare professional before using Fildena, especially if you have underlying health conditions or are taking other medications. While most side effects are temporary and mild, immediate medical attention is needed for any severe or persistent reactions.