Nitric oxide is a substance that causes blood vessels to relax. Both medications are generic now and can be found at discounted rates, making them more accessible to the public than ever before. This is why brand and generic medications often look different from one another. Which Lasts Longer? National Library of Medicine. Summary Cialis and Viagra are both pills for treating erectile dysfunction.If a pharmacy, or someone in the United States is offering generic Cialis (tadalafil), be very wary as there is a good chance it is fraudulent. If you are getting it . Is generic Cialis or tadalafil as effective as Cialis? Cialis and tadalafil are equally effective. The FDA works to ensure that the generic versions of all brand-name . 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 .
