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The first patent for Cialis expires in 2016. This is the earliest date that a generic form of Cialis could become available. However, other circumstances could extend the exclusivity period beyond 2016.This could include such things as other patents for specific Cialis uses or lawsuits.ialis Â® (tadalafil) is a prescription medicine that is licensed for treating erectile dysfunction (ED). It is also approved for treating enlarged prostate symptoms. It is manufactured by Eli Lilly and is currently protected by a patent that prevents any generic Cialis from being manufactured.
In clinical studies, Cialis began to work in as little as 30 minutes. For most people, though, it begins working within one hour. There are a number of factors that can increase or decrease how long Cialis lasts.any people considering taking Cialis Â® (tadalafil) wonder, How long does Cialis last?. The answer depends on a number of factors and will vary between individuals. However, in most people, Cialis will last for about 36 hours.