Viagra, or sildenafil, helps men achieve and maintain an erection by increasing blood flow to the penis. It does this by inhibiting an enzyme called phosphodiesterase-5 (PDE5).
PDE5 normally breaks down a chemical called cyclic guanosine monophosphate (cGMP). cGMP relaxes the muscles in the penis, allowing blood vessels to dilate and fill with blood. By blocking PDE5, Viagra allows cGMP levels to remain elevated, facilitating this process.
This increased blood flow leads to a firmer, more sustained erection when sexually stimulated. It’s important to note Viagra doesn’t cause an erection on its own; sexual stimulation is still necessary.
The effects typically begin within 30 to 60 minutes and can last for up to four hours. Dosage varies, and a doctor should determine the appropriate amount for individual needs.
Remember: Viagra is a prescription medication. Consult your doctor before use to discuss potential side effects and interactions with other medications.
Potential side effects can include headaches, flushing, nasal congestion, and visual disturbances. Discuss any concerns with your healthcare provider.
