Impotence is effective when you take Viagra. In itself, there are many types of impotence, and the effects vary depending on the specific situation. But in general, with this PDE5 inhibitor, which is often called Viagra, it definitely has some effect. This type of Viagra, also called Viagra and Sildenafil, is taken in two ways. One is to take it on demand, that is, to take it 2 hours to 3 hours before each sexual demand, and then you will be able to get an erection when you have sex. The other is to take it in small doses for a long period of time, which has a long-term effect on patients with organic lesions. Because it can improve the endothelial function of penile blood vessels. There are some patients with nerve damage who take Viagra in small doses for a long time, and there will also be some improvement. So in the clinic is often applied Viagra, there is no need to worry too much.