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Tadalafil is a selective phosphodiesterase (PDE) type 5 inhibitor similar to sildenafil and vardenafil. It is administered orally for the treatment of male erectile dysfunction (ED), pulmonary arterial hypertension (PAH), benign prostatic hypertrophy (BPH), or the concurrent treatment of erectile dysfunction and BPH. Tadalafil does not inhibit prostaglandins as do some agents for treating impotence (e.g., alprostadil). Unlike sildenafil, visual disturbances have not been reported with tadalafil, which is more selective for PDE5 than for PDE6 present in the retina.

The initial dosing is 2.5mg once daily, which can be increased to 5mg if the initial dosing is ineffective. If, after taking Cialis, Tadalafil, or any other ED drug, you find yourself with a painful erection for 4 hours or more, seek urgent medical advice. You may be suffering from Priapism