Understanding Viagra: A Comprehensive Guide Viagra, a brand-name prescription drug, is approved to treat erectile dysfunction (ED). With ED, individuals are unable to have or maintain an erection. Viagra is approved for this use in males ages eighteen years and older.To get more news about red viagra pills, you can visit herbal-hall.com official website. How Does Viagra Work? The active drug in Viagra is sildenafil. It belongs to a group of drugs called phosphodiesterase-type five inhibitors. japan tengsu Viagra works by blocking this enzyme from working, allowing more blood to flow into the penis and not be stopped by the enzyme. This also widens your blood vessels to allow more blood to flow into your penis. How Long Does Viagra Last? Viagra works at its best within a few hours after it’s taken. In most people, the drug is most effective about one hour after it’s taken. Over time, Viagra is slowly removed from the body. The Importance of Brand-Name Viagra Your prescription may have been filled with a generic version instead of brand-name Viagra. It’s important to ensure you receive the brand name your doctor prescribed. If you think your brand-name prescription has been filled with a generic, talk to your pharmacist. Conclusion Viagra has been a significant development in the treatment of erectile dysfunction. Its effectiveness and safety have made it a popular choice among individuals suffering from ED. Always consult with your doctor for any concerns or questions regarding Viagra.