Fildena Super Active is commonly used to treat erectile dysfunction, but like any medication, it can cause side effects. Common reactions include headaches, dizziness, flushing, nasal congestion, and upset stomach. More serious but rare side effects may involve sudden vision or hearing changes, chest pain, or prolonged erections lasting more than four hours, which require immediate medical attention. To manage mild side effects, it is important to take the medication exactly as prescribed and avoid exceeding the recommended dose.