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It was interesting to read the paper of McMahon et al, treating erectile dysfunction when PDE5 inhibitors fail,(Journal 2006)
I think still that Intracavernosal approach of injecting potent vasodilators is
a reliable method for diagnosis and treatment of erectile
dysfunction (ED),among which is Intracavernous sodium nitroprusside. The
authors ought to search carefully online as there seem to be many papers
published during the last two decades?