Eur J Pharmacol ; Neychev V, Mitev V. It has been used to treat impotence and seminal emission for thousands of years in China. Various chemical constituents of Herba Cistanche have been studied and were indicated to have some bio-activities such as antioxidation, neuroprotection and antiaging Another extract of Herba Cistanche, echinacoside, could elicit endothelium-dependent relaxation of aortic rings through NO-cGMP pathway in rats The penis is one of the areas where this enzyme works.Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called . A 50 milligram pill of Jin’ge, equal in dose to Viagra, costs 48 yuan, 60 percent lower than its overseas counterparts. Jin’ge comes in packs of one, two, three, four and 10 tablets. . Traditional Chinese medicine (TCM), including acupuncture and Chinese herbs, is used as an alternative therapy to increase the curative effect for erectile dysfunction (ED). A large .