Objectives: This study used pooled data from 2 large, phase III, double-blind, randomized, placebo-controlled studies for a subgroup analysis of the safety and efficacy of trospium chloride extended-release (XR) in men with overactive bladder (OAB).
Methods: A subgroup analysis was performed on data from the 176 male patients (trospium XR, 94; placebo, 82) who participated in 1 of the 2 studies. Patients received either trospium XR 60 mg or placebo once daily for 12 weeks.
Results: The mean age was 66.2 years for trospium XR and 63.1 years for placebo. A history of benign prostatic hyperplasia was recorded for 29 trospium XR recipients (30.9%) and 23 placebo recipients (28.0%). A total of 19 patients (20.2%) receiving trospium XR and 15 (18.3%) receiving placebo experienced ≥1 treatment-emergent adverse event considered at least possibly related to the study medication. Two trospium XR patients (2.1%) developed urinary retention; both were aged ≥75 years, and 1 had a history of prostate enlargement. Treatment with trospium XR compared with placebo resulted in significantly greater decreases from baseline in the mean number of daily toilet voids (-2.5 vs -1.5; P < .05) and urgency urinary incontinence episodes (-2.3 vs -1.4; P < .05) in men at week 12 (the coprimary efficacy variables).
Conclusions: Trospium XR is safe and effective in men with OAB. The risk of urinary retention is low and may be further decreased by careful patient selection.
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