Viagra, containing the active ingredient sildenafil, works by inhibiting an enzyme called phosphodiesterase-5 (PDE5). This enzyme normally breaks down cyclic guanosine monophosphate (cGMP), a molecule crucial for blood vessel relaxation.
Improved Blood Flow
By blocking PDE5, sildenafil allows cGMP levels to rise. Increased cGMP causes the smooth muscles in blood vessels to relax, leading to improved blood flow, particularly to the penis. This enhanced blood flow facilitates penile erection in response to sexual stimulation.
Important Considerations
Sildenafil’s effects are not automatic; sexual stimulation is necessary for an erection to occur. The drug does not increase libido or sexual desire. Side effects, though generally mild, can include headaches, flushing, and nasal congestion. It’s crucial to consult a doctor before using Viagra, especially if you have heart conditions, high blood pressure, or other health concerns.
Medication Interactions
Sildenafil can interact with certain medications, particularly nitrates used to treat chest pain. Combining these can cause a dangerous drop in blood pressure. Therefore, always inform your doctor about all medications you are taking before starting sildenafil.
Dosage and Administration
The recommended starting dose of Viagra is 50mg. Your doctor may adjust this based on your response and individual needs. It’s typically taken as needed, approximately 30-60 minutes before sexual activity.
