Viagra, or sildenafil, primarily works by increasing blood flow to the penis. This happens through the inhibition of an enzyme called phosphodiesterase-5 (PDE5). PDE5 normally breaks down cyclic GMP, a molecule crucial for smooth muscle relaxation. By blocking PDE5, Viagra allows cyclic GMP to persist, causing the blood vessels in the penis to relax and widen. This increased blood flow facilitates an erection in response to sexual stimulation. It’s important to note that Viagra doesn’t directly cause erections; it only enhances the body’s natural response to sexual stimulation.
Side Effects and Considerations
Common side effects include headache, facial flushing, nasal congestion, and visual disturbances. These are usually mild and temporary. More serious side effects are rare but include sudden vision loss or hearing loss. Consult a doctor immediately if you experience any of these. Viagra’s interaction with other medications, particularly nitrates, can be dangerous; therefore, always disclose all medications you’re taking to your physician before starting Viagra. Additionally, Viagra isn’t suitable for everyone; those with certain heart conditions or other health issues should avoid it.
Dosage and Administration
The typical starting dose is 50mg, taken as needed, about one hour before sexual activity. Your doctor may adjust this based on your response and individual health needs. Never exceed the recommended dose. Alcohol consumption can impair Viagra’s effectiveness and increase the risk of side effects. It’s crucial to follow your doctor’s instructions precisely.
