To investigate the effect of flavoxate (Urispadol(R)) treatment on pat
ients with symptomatic benign prostatic hypertrophy (BPH), with the ma
in weight on the irritative symptoms, a randomized, double-blind, para
llel-group, placebo-controlled and multicenter investigation was carri
ed out. Seventy patients entered the study, 37 were allocated to flavo
xate treatment on a daily dose of 1,200 mg (400 mg t.i.d.) for 12 week
s, and 33 patients were allocated to placebo treatment. In spite of a
sufficient power, the study did not discriminate the two treatment gro
ups in a statistically significant way (p > 0.05), when considering th
e main endpoints: the irritative symptom score and the global patient
evaluation. Conservative treatment of micturition disorders accompanyi
ng BPH with flavoxate in doses of 1,200 mg/day cannot be recommended f
or clinical use.