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Tadalafil (generic Cialis) is a member of a family of drugs known as PDE5 enzyme inhibitors. Tadalafil is known as the "36 hour pill" or the "weekend pill" because unlike other similar drugs, Tadalafil has a long duration of action. Although Tadalafil is similar to Levitra and Viagra, it`s dose, onset of action, and duration of action is unique.
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