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Tadalafil is a reversible phosphodiesterase type 5 (PDE5) inhibitor approved for the treatment of erectile dysfunction (ED). As a class, PDE5 inhibitors (including sildenafil [Viagra] and vardenafil [Levitra]), enhance erectile response to sexual stimulation by increasing penile blood flow. The duration of action of tadalafil is longer than that of sildenafil or vardenafil. One of these studies assessed improvements in erectile dysfunction and signs and symptoms of benign prostatic hyperplasia in patients with both conditions. The mean per-subject proportion of successful sexual intercourse attempts was 71.9 % with CIALIS 5 mg compared to 48.3 % with placebo.

Cialis was one of the first medicines to be approved for the treatment of erectile dysfunction. It’s been used by men around the world for over a decade, helping 80% achieve harder erections. Cialis and Tadalafil are essentially the same