Viagra, or sildenafil, works by inhibiting an enzyme called phosphodiesterase-5 (PDE5). PDE5 normally breaks down cyclic GMP, a molecule crucial for blood vessel relaxation in the penis. By blocking PDE5, Viagra increases cyclic GMP levels, allowing more blood to flow into the penis, leading to an erection.
Factors Affecting Viagra’s Effectiveness
Several factors influence how well Viagra works. These include the underlying cause of erectile dysfunction, overall health, the dosage taken, and potential drug interactions. Some medications, such as nitrates, should never be taken with Viagra due to dangerous interactions. Always consult your doctor before starting any medication.
Common Side Effects and Precautions
While generally well-tolerated, Viagra can cause side effects. Common ones include headaches, flushing, nasal congestion, and visual disturbances. Less common but more serious side effects include chest pain and sudden vision loss. If you experience any of these, seek immediate medical attention. Viagra isn’t appropriate for everyone; men with certain heart conditions, low blood pressure, or liver/kidney problems should avoid it.
| Headache | Common | Mild to Moderate |
| Flushing | Common | Mild |
| Nasal Congestion | Common | Mild |
| Visual Disturbances | Less Common | Mild to Moderate |
| Chest Pain | Rare | Severe |
Dosage and Administration
Viagra comes in various dosages. Your doctor will determine the appropriate dose based on your individual needs and health status. It’s typically taken orally, about an hour before sexual activity. Follow your doctor’s instructions carefully regarding dosage and frequency of use.
