Full Name: Tadalafil
Synonyms: (6R,12aR)-6-(1,3-benzodioxol-5-yl)-2-methyl-2,3,6,7,12,12a-hexahydropyrazino[1',2':1,6]pyrido[3,4-b]indole-1,4-dione
Tadalafil is a long-acting phosphodiesterase-5 (PDE5) inhibitor used for erectile dysfunction and benign prostatic hyperplasia, with a half-life of approximately 17.5 hours.