Viagra, or sildenafil, is a medication that treats erectile dysfunction (ED). It works by increasing blood flow to the penis. This allows men to achieve and maintain an erection sufficient for sexual activity.
Understanding the Mechanism
Specifically, Viagra inhibits an enzyme called phosphodiesterase-5 (PDE5). PDE5 normally breaks down a substance called cyclic GMP, which is crucial for penile blood vessel relaxation. By blocking PDE5, Viagra allows cyclic GMP levels to rise, leading to vasodilation (widening of blood vessels) in the penis. This increased blood flow is what facilitates an erection.
It’s important to note Viagra only works when sexual stimulation is present. It doesn’t cause erections spontaneously. The medication needs a trigger–sexual arousal–to initiate the process.
Consult your doctor before using Viagra, especially if you have heart conditions, high or low blood pressure, or are taking other medications. They can assess your suitability and provide guidance on safe usage.
