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Cialis received approval for use in the United States November 21, 2003.

Cialis is a member of a family of drugs known as PDE5 enzyme inhibitors.

Cialis is known as the ” 36 hour pill” or the “weekend pill” because unlike other similar drugs, Cialis has a long duration of action.

Cialis blocks an enzyme that causes an erection to go flaccid. Although Cialis is similar to Levitra and Viagra, its dose, onset of action, and duration of action is unique.

Cialis is a member of a family of drugs called PDE5 Inhibitors. Cialis is now marketed in approximately 40 countries and is available by prescription in pharmacies on five continents.

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