Whether using health care products or drugs, we must understand the effect of this product clearly. Viagra is a product used by some men. The effect of this product is that it can improve the weakness of the waist and knees caused by kidney deficiency and the unhealthy reproduction of men, such as erectile dysfunction. And it can also play a role in improving the relationship between husband and wife. This drug is also called viagra. In addition, it can improve sexual desire to a certain extent.