Tadalafil: Your Complete Guide to This Proven Erectile Dysfunction Solution What is Tadalafil? (Cialis, Adcirca): Mechanism, Uses, and Effectiveness Tadalafil is a widely prescribed medication for erectile dysfunction (ED), benign prostatic hyperplasia (BPH), and in some cases, for treating pulmonary arterial hypertension (PAH). Sold under brand names like Cialis and Adcirca, tadalafil is a phosphodiesterase…