Viagra, or sildenafil, primarily works by inhibiting phosphodiesterase-5 (PDE5). This enzyme breaks down cyclic guanosine monophosphate (cGMP), a crucial molecule for penile erection. By blocking PDE5, Viagra allows cGMP levels to remain elevated.
Increased cGMP: The Key to Erection
Higher cGMP levels cause the smooth muscles in the penis to relax. This relaxation increases blood flow into the corpora cavernosa, the spongy tissues responsible for penile engorgement. The increased blood flow, combined with reduced venous outflow, leads to a firm erection.
It’s important to note that Viagra doesn’t directly cause erections; it facilitates them by enhancing the body’s natural response to sexual stimulation. Sexual stimulation is still required to trigger the release of nitric oxide, initiating the cGMP pathway.
The effect typically lasts for several hours, varying depending on individual factors and dosage. Remember to consult a healthcare professional for accurate information and personalized guidance.
