The Science Behind How Viagra Functions
Understanding PDE5 Inhibition
Viagra contains sildenafil citrate, which belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors. When you become sexually aroused, your body naturally releases nitric oxide in the penis. This chemical triggers the production of cyclic guanosine monophosphate (cGMP), which relaxes smooth muscle cells and allows blood vessels to widen.
However, the enzyme PDE5 breaks down cGMP, which can limit blood flow and make it difficult to achieve or maintain an erection. Viagra works by blocking PDE5, allowing cGMP levels to remain elevated and blood flow to increase when you're sexually stimulated.
Timing and Duration of Effects
Viagra typically begins working within 30-60 minutes of taking the tablet, though this can vary between individuals. The medication reaches peak concentration in your bloodstream approximately 60-120 minutes after consumption. Food, particularly fatty meals, may delay absorption and slow the onset of effects.
The effects of Viagra can last 4-6 hours in your system, but this doesn't mean you'll have an erection for this entire period. The medication simply makes it easier to achieve an erection when sexually aroused during this timeframe. Once sexual activity ends, the erection naturally subsides.
Dosage and Effectiveness
Viagra is available in 25mg, 50mg, and 100mg strengths. Most men start with a 50mg dose, which can be adjusted based on effectiveness and any side effects experienced. It's important to take only one dose within a 24-hour period and to follow your prescriber's guidance on dosage.
At EverydayMeds, patients can choose between branded Viagra and generic sildenafil at checkout. Both contain the same active ingredient and work identically in the body - the choice often comes down to personal preference and budget considerations.
Important Safety Considerations
Viagra doesn't automatically cause erections - sexual stimulation is still required for the medication to be effective. The drug works by enhancing your body's natural response to arousal rather than replacing it entirely.
Certain medications, particularly nitrates used for chest pain, can interact dangerously with Viagra. It's crucial to complete a thorough medical assessment before starting treatment to ensure the medication is safe for you.
