Need a clear explanation of Viagra’s mechanism? Focus on its primary action: Viagra enhances the effects of nitric oxide, a naturally occurring molecule in your body responsible for relaxing blood vessels. This relaxation allows increased blood flow, particularly crucial for achieving and maintaining an erection.
Specifically, Viagra inhibits the enzyme phosphodiesterase-5 (PDE5). PDE5 normally breaks down cyclic GMP, a molecule that facilitates blood vessel relaxation. By blocking PDE5, Viagra allows cyclic GMP to persist, prolonging the relaxation and thus improving blood flow to the penis. This process is highly targeted; it doesn’t affect blood flow throughout the entire body.
Important Note: Viagra requires sexual stimulation to work. It doesn’t spontaneously cause erections. The increased blood flow is a response to sexual arousal, making the erection firmer and longer-lasting. Always consult your doctor before starting Viagra; it may not be suitable for everyone, and there are potential side effects.
