The other, provera, inhibits production of testosterone in the testes themselves. First, for those practitioners who treat erectile dysfunction with traditional psychological methods, there may be challenges to the psychological methods used to treat such states stemming from both the mere existence of an alternate treatment modality and a benchmark that psychologists treating by traditional methods must match or exceed. While this illustration focussed on Viagra, the general principle holds for all conditions that are amenable to multiple forms of treatment. Neurotransmission and the contraction and relaxation of penile erectile tissue. World Journal of Urology.
Nitric oxide is a potent relaxant of human and rabbit corpus cavernosum.
Journal of Urology. Sildenafil, a novel effective oral therapy for male erectile dysfunction. British Journal of Urology. Journal of Impotence Research. The role of histamine in human penile erection.