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Patients reporting satisfaction with treatment effect on erections and improvement in ability to engage in sexual activity at end of 1 year, 2 years, and 3 years of open-label treatment with sildenafil. Copyright © 2002. Carson CC, Burnett AL, Levine LA, et al. 2002. The efficacy of sildenafil citrate (Viagra) in clinical populations: an update. Urology, 60:12–27.
