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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.
But it is best to take it before 30 minutes before your sexual encounter for the best result. Avoid taking it if you are allergic to it or any medication, talk to your treating physician before start taking it. In the US, even though sildenafil is available only by prescription from a doctor, it was advertised directly to consumers on TV (famously being endorsed by former United States Senator Bob Dole and football star Pelé).
Nitric oxide then activates the enzyme guanylate cyclase, which results in increased levels of cGMP. Cyclic guanosine monophosphate causes smooth muscle relaxation in the corpus cavernosum thereby allowing inflow of blood