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Phosphodiesterase-5 inhibitors are known mainly for treating erectile dysfunction, but one of them — tadalafil (Cialis) — also is FDA-approved for treating patients with symptomatic benign prostatic hyperplasia (BPH); the mechanism of action for mitigating BPH is unclear.
In this analysis of pooled data from four previously published randomized trials, industry-supported researchers present outcomes in about 1200 men with moderate-to-severe BPH who received daily tadalafil (5 mg) or placebo for 12 weeks. The 35-point International Prostate Symptom Score (I-PSS) improved by an average of about 2 points more with tadalafil than with placebo, which is a significant difference. Additionally, from a mean baseline maximum urinary flow rate of abou…