Tadalafil works by inhibiting phosphodiesterase-5 (PDE5), a specific enzyme found in the smooth muscles of blood vessels and other tissues. This inhibition increases the levels of cyclic guanosine monophosphate (cGMP), a crucial messenger molecule that relaxes these muscles. This relaxation leads to vasodilation, or widening of blood vessels.
Impact on Erectile Function
In the context of erectile dysfunction, increased cGMP in the penis causes the smooth muscles in the corpora cavernosa to relax. This allows increased blood flow into the penis, resulting in an erection. The duration of action of Tadalafil, leading to a longer period of potential erectile function compared to other PDE5 inhibitors, stems from its longer half-life. This means the body eliminates it more slowly.
Beyond Erectile Dysfunction
Beyond its role in erectile dysfunction, Tadalafil’s PDE5 inhibition also affects blood vessels in other parts of the body. This explains its use in treating pulmonary arterial hypertension (PAH), where it improves blood flow to the lungs.
