The penile injection
relaxes the smooth muscles in the arterial walls of
the penis and allows blood to flow in. For men who experience
impotence after prostate cancer treatment, penile injections
may be an option. A man mixes the solution in a large
needle than fills a small syringe which he uses to inject
directly into his penis. Unlike the oral PDE 5 inhibitors,
penile injection causes erection whether there is sexual
arousal or not.
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