Viagra, or sildenafil citrate, is a medication primarily used to treat erectile dysfunction (ED) in men. It works by increasing blood flow to the penis.
Understanding the Mechanism
Here’s how it functions: Viagra inhibits an enzyme called phosphodiesterase-5 (PDE5). This enzyme typically breaks down cyclic guanosine monophosphate (cGMP), a molecule that relaxes the muscles in the penis, allowing for increased blood flow. By blocking PDE5, Viagra allows cGMP levels to rise, facilitating penile engorgement and enabling an erection.
Important Considerations
- Viagra is only effective with sexual stimulation. It doesn’t create spontaneous erections. It’s crucial to consult a doctor before using Viagra, especially if you have heart conditions, high blood pressure, or other health concerns. Side effects can include headache, flushing, nasal congestion, and visual disturbances. A physician can discuss potential risks.
Types of Viagra
Brand-name Viagra (Pfizer) Generic sildenafil (various manufacturers)
Generic sildenafil contains the same active ingredient as brand-name Viagra but is typically less expensive.
Dosage and Administration
Dosage varies depending on individual needs and doctor’s recommendations. Always follow prescribed instructions carefully. Viagra is usually taken orally about an hour before sexual activity.
Alternatives to Viagra
Other medications are available to treat ED. Your doctor can help you find the best option for your specific situation. These include Cialis (tadalafil) and Levitra (vardenafil).
