This double-blind study showed the effectiveness of Viagra (sildenafil citrate) in treating erectile dysfunction in men with multiple sclerosis. Seems like an obvious conclusion, but studies are generally a good thing to have...one interesting item to note in the abstract is the large response to placebo!

"OBJECTIVE: Identifying and effectively treating erectile dysfunction (ED) can result in an improvement of the quality of life (QoL) in men with multiple sclerosis (MS)...CONCLUSION: Sildenafil treatment for ED in men with MS was effective and well tolerated, and resulted in significant improvements in both general and disease specific QoL variables."

Click "read more" for the full abstract...

A small trial of Viagra for women with multiple sclerosis showed very limited benefit, only in the domain of lubrication. Let the giggling begin.

"PURPOSE: We assessed the tolerability, safety and efficacy of sildenafil (brand name: Viagra) for the treatment of women with sexual dysfunction secondary to multiple sclerosis, as well as the role of somatosensory evoked potential neurophysiological testing...

CONCLUSIONS: Sildenafil only appeared to produce limited benefit in certain individuals with female sexual dysfunction. Some measure of the extent of neurological deficit in these patients could be ascertained from the latency of tibial evoked potentials, which correlated with pudendal evoked potentials. However, it could not predict the extent of sexual dysfunction. Sildenafil is unlikely to help all patients with neurogenic female sexual dysfunction."

Click "read more" for the full abstract.