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Urology. 1999 Apr;53(4):800-5.

Sildenafil citrate (Viagra) in erectile dysfunction: near normalization in men with broad-spectrum erectile dysfunction compared with age-matched healthy control subjects.

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Royal Victoria Hospital, Belfast, United Kingdom.

Erratum in

  • Urology 1999 May;53(5):1072.



To evaluate the efficacy, safety, and tolerability of sildenafil in men with broad-spectrum erectile dysfunction (ED), with reference to age-matched healthy control subjects.


One hundred eleven patients were enrolled in a randomized, double-blind, placebo-controlled, parallel-group, 12-week, flexible-dose study. Efficacy assessments included the International Index of Erectile Function (IIEF), a global assessment question, and patient event log data. In a separate, nontreatment study, 109 control subjects also completed the IIEF.


Mean IIEF scores at baseline were significantly lower for patients with ED than for control subjects without a history of ED. After treatment, mean IIEF scores for patients receiving sildenafil approached values observed in control subjects and were significantly higher than mean scores for patients receiving placebo (P<0.01). Responses to the global assessment question and patient log data corroborated the IIEF results. Sildenafil was well tolerated, with no discontinuations because of adverse events.


The results indicate that sildenafil, an effective oral therapy for the treatment of broad-spectrum ED, is associated with a near normalization of patient erectile function.

[Indexed for MEDLINE]

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