The Science Behind Viagra's Mechanism of Action
What Happens When You Take Viagra
When you take Viagra (sildenafil), the medication works by targeting a specific enzyme in your body called phosphodiesterase type 5 (PDE5). This enzyme is naturally present in the blood vessels of the penis and plays a crucial role in regulating blood flow. Under normal circumstances, when you become sexually aroused, your body releases nitric oxide, which triggers a cascade of reactions leading to increased blood flow to the penis.
The PDE5 Inhibition Process
Viagra belongs to a class of medications called PDE5 inhibitors. By blocking the PDE5 enzyme, sildenafil prevents the breakdown of a chemical messenger called cyclic guanosine monophosphate (cGMP). This chemical is responsible for relaxing the smooth muscles in the blood vessels of the penis, allowing them to widen and increase blood flow. The result is improved ability to achieve and maintain an erection when sexually stimulated.
Timing and Duration of Effects
After taking Viagra, you can typically expect the medication to start working within 30 to 60 minutes. However, the timing can vary depending on several factors, including whether you've eaten recently, particularly fatty foods, which may delay absorption. The effects of sildenafil can remain in your system for approximately 4 to 6 hours, though this doesn't mean you'll have an erection for this entire duration.
The Importance of Sexual Stimulation
It's crucial to understand that Viagra doesn't automatically cause an erection. Sexual arousal and stimulation are still necessary for the medication to be effective. The medication simply enhances your body's natural response to sexual stimulation by improving blood flow to the penis. Without arousal, the initial trigger of nitric oxide release won't occur, and the medication won't produce the desired effect.
Dosage and Effectiveness
Viagra is available in three strengths: 25mg, 50mg, and 100mg tablets. Most men start with a 50mg dose, which can be adjusted up to 100mg or down to 25mg based on effectiveness and any side effects experienced. At EverydayMeds, we provide both branded Viagra and generic sildenafil in these dosages, with the generic option offering the same active ingredient at a more affordable price point. Our prescribers will determine the most appropriate starting dose during your consultation.
Factors Affecting How Viagra Works
Several factors can influence how effectively Viagra works in your body. Age can play a role, as older men may require higher doses or experience slower onset times. Underlying health conditions, particularly those affecting cardiovascular health, can impact the medication's effectiveness. Additionally, psychological factors such as stress, anxiety, or relationship issues can influence the medication's success, as these can interfere with the arousal process necessary for the medication to work.
