Viagra, also known as sildenafil, is a medication used to treat erectile dysfunction (ED). It works by increasing blood flow to the penis, helping men achieve and maintain an erection.
Specifically, Viagra inhibits an enzyme called phosphodiesterase-5 (PDE5). PDE5 breaks down a chemical called cyclic guanosine monophosphate (cGMP), which is crucial for penile blood vessel relaxation. By blocking PDE5, Viagra allows cGMP levels to rise, leading to increased blood flow and facilitating an erection.
Here’s a simplified breakdown:
| 1. Sexual Stimulation | Sexual stimulation triggers the release of nitric oxide. |
| 2. Nitric Oxide Action | Nitric oxide increases cGMP levels. |
| 3. Viagra’s Role | Viagra prevents cGMP breakdown by inhibiting PDE5. |
| 4. Result | Increased cGMP leads to relaxed blood vessels, improved blood flow to the penis, and an erection. |
Remember, Viagra only works with sexual stimulation. It doesn’t cause erections spontaneously. Consult your doctor before using Viagra, as it may interact with other medications and have potential side effects.
