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Tadalis SX 20 mg is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient Tadalafil, a type of phosphodiesterase type 5 (PDE5) inhibitor. This class of medications works by increasing blood flow to the penis, which helps men achieve and maintain an erection when sexually aroused. Tadalis SX 20 mg is a popular alternative to other ED treatments due to its long-lasting effects, sometimes up to 36 hours, which is why it is often referred to as the "weekend pill."