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Follow your doctor’s directions carefully, and ask your doctor or pharmacist to explain any part you do not understand. Tadalafil works by inhibiting a potent enzyme called phosphodiesterase-5 (PDE-5). This enzyme is responsible for prevention of breakdown of a chemical known as cyclic guanosine monophosphate (cGMP). During sexual arousal, blood vessels in penis release nitric oxide (NO). NO activates an another enzyme guanylate cyclase, and this enzyme increase the levels of cGMP in the penis.
It may also be used for the treatment of Benign Prostatic Hyperplasia (BPH) in patients with an enlarged prostate. If you are taking tadalafil to treat erectile dysfunction, follow your doctor's directions and the guidelines in this paragraph. There are two different ways to take tadalafil, either daily or on an as needed basis. Talk to your doctor about which dosing schedule is right for you. Tadalafil is sometimes taken as needed, usually at least 30 minutes before sexual activity and not more often than once every 24 hours.
However, improvements in erectile function were not as pronounced in this population as in ED patients without diabetes in other studies. These studies have shown the efficacy of combined therapy with PDE5i and α-adrenergic antagonists in patients with LUTS. From these results, doxazosin is more risky in association with tadalafil, compared to tamsulosin and alfuzosin