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Tadalafil is a medication primarily used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). It belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. Tadalafil works by increasing blood flow to specific areas of the body, making it easier for men to achieve and maintain an erection during sexual activity. It is also used to improve exercise capacity in individuals with PAH, a condition characterized by high blood pressure in the lungs.