Both Cialis and Viagra work quickly. Cialis and Viagra are equally effective. National Library of Medicine. Talk with your healthcare provider about your sex life and desired use. There is also the option to take Cialis as needed. Also, what does 5mg dose do daily?Cialis is available as the generic drug tadalafil. A generic drug is an exact copy of the active drug in a brand-name medication and is considered just as safe and . Yes. The active ingredient for Cialis, tadalafil, is also the active ingredient for Adcirca, a brand-name drug used to treat pulmonary arterial hypertension, or high blood . Drug Facts Common Brands Cialis Drug Class PDE-5 inhibitor Controlled Substance Classification Not a controlled medication Generic Status No lower-cost .