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Viagra was randomly allocated and led to marked improvement in erectile function. Furthermore, those participants who responded favourably to the treatment (including those in the placebo who showed some improvement as a result of the psychological screening process and the general commitment of resources to them), showed a clinically significant relief of depressive symptoms and improvement in the quality-of-life indicators as against those participants whose ED did not respond to treatment at all. This does not mean, of course, that Viagra can be used to treat depression. But the evidence is clear. In other trials involving Viagra, the measurement of quality-of-life showed improvement in 46% of diabetic men and 72% of men with spinal cord injuries. buy viagra us pharm cialis cost sell australia single viagra cialis softabs generic buy viagra now