Filitra 20 contains vardenafil, which works by increasing blood flow to the penis during sexual stimulation. This helps men achieve and maintain erections sufficient for sexual activity, improving erectile function and overall sexual performance. Vardenafil, the active ingredient in Filitra 20, is generally well-tolerated by most men. Common side effects may include headache, indigestion, flushing, nasal congestion, and dizziness, but these are usually mild and temporary. Filitra 20 can remain effective for up to 4 to 6 hours after ingestion. This duration of action provides a sufficient window of opportunity for sexual activity, allowing for satisfactory intimate experiences.