Tadalis SX 20 mg is a medication that contains Tadalafil, which is the same active ingredient found in Cialis and other tadalafil-based treatments. It is primarily used to treat erectile dysfunction (ED) in men, but it is also sometimes prescribed for benign prostatic hyperplasia (BPH). Tadalis SX 20 mg is a specific brand of Tadalafil that is often marketed for its long-lasting effects.