Understanding Viagra's Mechanism of Action
The Science Behind Viagra
Viagra contains sildenafil citrate as its active ingredient, which belongs to a class of medications called PDE5 inhibitors. When a man becomes sexually aroused, his body naturally produces nitric oxide, which triggers a chemical reaction that increases blood flow to the penis. However, the enzyme phosphodiesterase type 5 (PDE5) can break down this process, making it difficult to achieve or maintain an erection.
How Viagra Blocks PDE5
Viagra works by temporarily blocking the PDE5 enzyme, allowing the natural chemical processes to continue uninterrupted. This enables the smooth muscle in the blood vessels of the penis to relax and expand, increasing blood flow when sexually stimulated. It's important to note that Viagra does not cause automatic erections - sexual arousal is still required for the medication to be effective.
Timing and Duration
Viagra typically begins working within 30-60 minutes of taking the tablet. The medication can remain effective for up to 4-6 hours, though this doesn't mean an erection will last this entire duration. Food, particularly fatty meals, may delay how quickly Viagra starts working. For optimal results, many men find taking Viagra on an empty stomach or after a light meal works best.
Dosage Options Available
Viagra is available in three strengths: 25mg, 50mg, and 100mg tablets. Most men start with the 50mg dose, which can be adjusted based on effectiveness and any side effects experienced. Only one tablet should be taken within a 24-hour period. At EverydayMeds, patients can choose between branded Viagra or generic sildenafil during checkout, both containing the same active ingredient.
Who Can Use Viagra
Viagra is suitable for adult men experiencing erectile dysfunction, following a clinical consultation with a UK-licensed prescriber. The medication requires a prescription after completing an online assessment that evaluates cardiovascular health, current medications, and medical history. Certain conditions and medications may make Viagra unsuitable, including the use of nitrate medications or severe heart conditions.
