Cialis Drug Classification Pronunciation: /təˈdæləfɪl/ tə-DAL-ə-fil Onset of action: 30 minutes Protein binding: 94% Metabolism: Liver (predominantly CYP3A4) Pregnancy category: : AU: B1; AHFS/Drugs.com: Monograph ATC code: G04BE08 (WHO) What is Cialis? Cialis 40mg x 10 ...