Tadfil 20 mg is typically taken orally, as needed, approximately 30 minutes to 1 hour before sexual activity. The dosage may be adjusted based on individual response and tolerability, but it is generally recommended to start with the lowest effective dose.Tadfil 20 mg is effective in improving erectile function in men with ED. It helps men achieve and sustain erections when sexually aroused. However, sexual stimulation is still required for the medication to work.