Clinical Evidence: How Effective Is Viagra?
How Does Viagra Work in the Body?
Viagra contains sildenafil citrate, a PDE5 inhibitor that works by blocking the phosphodiesterase type 5 enzyme. This allows increased blood flow to the penis during sexual arousal. Importantly, Viagra does not cause automatic erections - sexual stimulation remains necessary for the medication to be effective. The enhanced blood flow mechanism typically begins working within 30-60 minutes of taking the tablet.
Clinical Success Rates and Effectiveness
Clinical trials demonstrate that Viagra works for approximately 70-80% of men with erectile dysfunction across various underlying causes. Success rates may vary depending on factors such as age, overall health, severity of erectile dysfunction, and underlying medical conditions like diabetes or cardiovascular disease. Men with psychological causes of erectile dysfunction often experience higher success rates compared to those with severe physical causes.
Branded Viagra vs Generic Sildenafil
At EverydayMeds, patients can choose between branded Viagra (manufactured by Pfizer) and generic Sildenafil at checkout. Both contain identical active ingredients and demonstrate equivalent effectiveness in clinical studies. The main difference lies in cost - generic Sildenafil typically offers significant savings whilst delivering the same therapeutic benefits. Our UK-licensed prescribers can advise which option might suit your individual needs and budget during the consultation process.
Dosage Options and Optimisation
Viagra and Sildenafil are available in 25mg, 50mg, and 100mg strengths. Most men start with 50mg, taken approximately one hour before sexual activity. Depending on effectiveness and tolerability, the dose may be adjusted to 25mg or increased to 100mg. Only one dose should be taken within any 24-hour period. Food, particularly fatty meals, can delay the onset of action.
What to Expect During Treatment
When Viagra works effectively, men typically notice improved ability to achieve and maintain erections suitable for sexual activity. The medication can remain active for 4-6 hours, though this does not mean erections last continuously during this period. Some men may notice gradual improvement over several uses as confidence returns. Side effects, when they occur, are usually mild and may include headache, facial flushing, or nasal congestion.
When Viagra May Not Work
Certain factors can reduce Viagra's effectiveness. These include severe cardiovascular disease, very low testosterone levels, significant psychological stress, or taking medications that interact with sildenafil. Alcohol consumption can also impair the medication's effectiveness. Additionally, men taking nitrate medications cannot safely use Viagra due to dangerous interactions that can cause severe drops in blood pressure.
