Viagra and Jingo are the trade names of the drugs and the generic name is Sildenafil Citrate. The two drugs have the same ingredients, but the manufacturers are different, so the trade names of the drugs are also different, but the main efficacy and clinical applications are the same. Sildenafil citrate is a selective inhibitor of phosphodiesterase and is mainly used to improve sexual dysfunction in men. The erection of the penis is correlated with the release of nitric oxide. Sildenafil enhances the effect of nitric oxide through the inhibition of phosphodiesterase, which relaxes the smooth muscle of the penile corpus cavernosum and allows more blood to flow into the penis, resulting in an erection. However, sexual stimulation is required for this drug to have a therapeutic effect, and if there is no sexual stimulation, it will not work.