Viagra, containing sildenafil, works by increasing blood flow to the penis. This allows for easier achievement and maintenance of an erection during sexual stimulation. It’s crucial to understand that Viagra doesn’t automatically cause an erection; sexual stimulation is still required.
How Viagra Works
Sildenafil inhibits an enzyme called phosphodiesterase-5 (PDE5). PDE5 breakdown of cGMP, a chemical that relaxes muscles in the penis, is blocked by sildenafil, leading to increased blood flow. This process is triggered only by sexual arousal.
Dosage and Administration
A typical starting dose is 50mg, taken approximately one hour before sexual activity. Your doctor might adjust this based on your response and any pre-existing health conditions. Never exceed the recommended dosage. The effects generally last for four to five hours.
Potential Side Effects
Common side effects include headache, flushing, nasal congestion, and indigestion. More serious, though rare, side effects include vision changes and hearing loss. Consult your doctor immediately if you experience these or any other concerning symptoms. This information is not a substitute for professional medical advice.
Drug Interactions
Viagra can interact with certain medications, particularly nitrates used to treat chest pain. This combination can cause a dangerous drop in blood pressure. Inform your doctor about all medications, including over-the-counter drugs and supplements, before taking Viagra.
