yes, it is recognized by the fda as an ercetile dysfunction drug. dose is 5-10 mg 20 min's before sex.
"Research has indicated that a natural alpha-2 adrenergic blockade performed by the body's own chemicals is part of the normal physiology of erection. According to theory, inhibition of the alpha-2 adrenergic system should increase the flow of blood through arteries into the penis, while at the same time decreasing the flow of blood out from the penis through veins. It may also result in higher levels of the neurotransmitter ACh, which as noted earlier, causes erections by stimulating the production of NO in the arteries that supply the penis."
jb