Cialis is a PDE-5 inhibitor. Another way you can think of Cialis (and all other similar medicines) is that it preserves the elevated levels of cGMP (enzyme) that are created when a man is sexually stimulated for a stronger, more lasting erection. The nice thing about these inhibitors is that they shouldn't cause erections at inappropriate times because they only block degradation of cGMP produced in reaction to sexual stimulation, such as thinking about something sexy.
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