Tadalafil 20mg is a medication commonly used to treat erectile dysfunction (ED) and symptoms of benign prostatic hyperplasia (BPH). It’s also sometimes used for pulmonary arterial hypertension. Tadalafil belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to certain areas of the body. Tadalafil can interact with certain medications, particularly nitrates used for chest pain, and may cause a dangerous drop in blood pressure. Always follow your healthcare provider's instructions and consult them if you have any questions or concerns about using tadalafil.