Viagra facilitates erections by increasing blood flow to the penis. This happens because Viagra inhibits an enzyme called phosphodiesterase-5 (PDE5). PDE5 normally breaks down cGMP, a molecule crucial for relaxing the muscles in the penis, allowing blood vessels to dilate and fill with blood.
The Mechanism of Action
By blocking PDE5, Viagra allows cGMP levels to remain high. This sustained elevation of cGMP leads to prolonged relaxation of penile muscles, resulting in an erection. It’s important to note that sexual stimulation is still necessary to initiate the process; Viagra doesn’t cause erections spontaneously.
Factors Influencing Effectiveness
| Underlying health conditions (e. g., diabetes, heart disease) | May reduce effectiveness or contraindicate use. |
| Medication interactions | Some medications can interfere with Viagra’s action. |
| Alcohol consumption | Excessive alcohol can impair erectile function and reduce Viagra’s effectiveness. |
| Age | Effectiveness may vary with age. |
Timing and Dosage
Viagra typically takes effect within 30-60 minutes and lasts for up to 4 hours. The recommended dosage is typically 50mg, but your doctor might adjust it depending on individual needs and responses. Always follow your doctor’s instructions.
Potential Side Effects
Common side effects include headache, flushing, nasal congestion, and visual disturbances. Severe side effects are rare but require immediate medical attention. Consult a doctor if you experience any unexpected or concerning symptoms.
