Cialis' official name is Tadalafil. Produced by Lilly's own labs They all contain the same active ingredient (also known as "molecule") as their branded counterparts. Because of this, their actions are similar. The patent on the medicine has expired, allowing labs to engage in price competition, which has resulted in the most appealing pricing of the generic. The monopoly has been broken. It's the excipients that make the distinction between an original and a generic drug. Side effects may be somewhat different due to this fact.