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Vasodilators cause blood vessels to expand, thereby increasing blood flow.
Papaverine is used to produce erections in some impotent men. Papaverine injection should not be used as a sexual aid by men who are not impotent. If the medicine is not used properly, permanent damage to the penis and loss of the ability to have erections could result. In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make.