Cialis

Cialis® was originally patented and sold by Eli Lilly. Tadalafil is the chemical name of the active ingredient in Cialis®. After the patent expired in 2018, the FDA gave permission to other drug companies to manufacture a generic version of Cialis® (act the same way in the body and are expected to produce the same effects as the original brand name drug).
Generic drugs are generally much cheaper than the original brand name drug, and most drugs prescribed in the US are generic.

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