Tadalafil, the active ingredient in Tadfil 20 mg, is known for its efficacy in improving erectile function. Clinical studies have shown that Tadalafil is effective in helping men with ED achieve and sustain erections suitable for sexual activity. Tadfil 20 mg can be taken on an as-needed basis, allowing men to use it before anticipated sexual activity. It can also be used as a daily low-dose regimen for men who engage in sexual activity more frequently.