Property:It is white to off-white crystallinepowder, odorless，bitter taste, soluble in water and ethanol Contents:Above 99%. It’s used to improve men’s sexual ability and their life qulity. it takes 15 minutes to work after taking 20mg once (once a day). Soluble in water, it can be made to be oral liquors, health wines and soft capsules, bring no side effect.
Characteristics:Comparing with the similar products, vardenafil（Levitra） takes less time to work, has persistent effect with high erection stiffness and security; The dose is little: according to the clinical dose, the effect of 5, 10, and 20mg of
vardenafil（Levitra） is equal to that of 25, 50 and 100mg of Sildenafil.
Pharmacokinetics:Penile erection is caused by the engorgement of the penis with blood. This engorgement occurs when the blood vessels delivering blood to the penis increase in size and increase the delivery of blood to the penis. At the same time, the blood vessels carrying blood away from the penis decrease in size and decrease the removal of blood from the penis. Sexual stimulation that leads to the engorgement and erection causes the production and release of nitric oxide in the penis. Nitric oxide then activates the enzyme, guanylate cyclase to produce cyclic guanosine monophosphate (cGMP). The GMP is primarily responsible for increasing and decreasing the size of the blood vessels carrying blood to and from the penis, respectively. Vardenafil（Levitra）prevents an enzyme called phosphodiesterase-5 from destroying cGMP so that cGMP persists longer.
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