Viagra Mechanism of Action Explained
The Science Behind Viagra's Effectiveness
Viagra contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor that works by blocking a specific enzyme in your blood vessels. When sexually aroused, your body naturally produces nitric oxide, which triggers the release of cyclic guanosine monophosphate (cGMP). This chemical relaxes smooth muscle tissue and dilates blood vessels in the penis, allowing increased blood flow.
The PDE5 enzyme normally breaks down cGMP, reducing blood flow. Viagra prevents this breakdown, maintaining the vasodilation effect and supporting sustained erections during sexual activity. It's important to understand that Viagra does not cause automatic erections - sexual stimulation remains necessary for the medication to be effective.
Timing and Duration of Effects
Most men find Viagra begins working within 30-60 minutes of taking the tablet. However, fatty meals can delay absorption and slow the onset of action. The medication's effects typically last 4-6 hours, though this doesn't mean you'll maintain an erection for this entire period - rather, you may find it easier to achieve erections during this timeframe when sexually stimulated.
Taking Viagra on an empty stomach or with a light meal generally provides the most predictable results. Alcohol consumption should be limited, as it can reduce the medication's effectiveness and increase the risk of side effects like dizziness or low blood pressure.
Dosage and Treatment Options
Viagra is available in 25mg, 50mg, and 100mg strengths, with 50mg being the typical starting dose for most men. Your prescriber may adjust this based on how well the medication works and any side effects experienced. The maximum recommended dose is 100mg, and you should never take more than one dose within 24 hours.
At EverydayMeds, patients can choose between branded Viagra and generic sildenafil during checkout. Both contain the same active ingredient and work identically, with generic sildenafil offering a more cost-effective option whilst maintaining the same clinical effectiveness and safety profile as the branded version.
