Cialis is a prescription drug for the treatment of erectile dysfunction (ED). Cialis is the brand name of the drug tadalafil. This medication is known technically as a "reversible phosphodiesterase type 5 (PDE5) inhibitor". PDE5 inhibitors increase blood flow to the genitals. Cialis functions the same way as other PDE5 inhibitors in the treatment of ED. Viagra, Levitra and Cialis are all PDE5 inhibitors. As with other ED drugs, Cialis is only effective during sexual stimulation. The mere act of taking Cialis will not cause an erection in men.
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