Viagra 100mg working time: In a large study on

In a large study on more than 8000 patients, 82% reported improvements in their erections after taking 100mg sildenafil. Although this demonstrates a very high success rate, it shows how the treatment doesn’t always work for everyone. The question is: why? Sildenafil 100mg can be safe and effective—but only when prescribed and monitored by a healthcare provider. Daily use without supervision increases the risk of side effects and may not be suitable for everyone. How Long Does It Take for Sildenafil to Work? Typically, it takes half an hour to one hour for Sildenafil to start working, so you should allow for that suggested timeframe before engaging in sexual intercourse. It may be reassuring however, that after you take it, it can last for up to four hours in your system. Learn about uses, how it works, and more for Viagra (sildenafil). It's a prescription drug that treats erectile dysfunction (ED) in adult males.