Tadalafil is a medication primarily used for the treatment of erectile dysfunction (ED) in men. It is FDA-approved and is also suitable for the treatment of pulmonary arterial hypertension (PAH). Tadalafil has a long duration of action and is often referred to as the "weekend pill" because it remains effective for up to 36 hours. Modern applications also include the treatment of sexual dysfunction and improving blood circulation. Tadalafil was approved by the FDA in 2003.
