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  • Title: Tolterodine: superior tolerability than and comparable efficacy to oxybutynin in individuals 50 years old or older with overactive bladder: a randomized controlled trial.
    Author: Malone-Lee J, Shaffu B, Anand C, Powell C.
    Journal: J Urol; 2001 May; 165(5):1452-6. PubMed ID: 11342895.
    Abstract:
    PURPOSE: We compared the tolerability and clinical efficacy of tolterodine with those of oxybutynin in patients with an overactive bladder using an upward oxybutynin dose titration strategy analogous to that used in routine clinical practice in the United Kingdom and Republic of Ireland. MATERIALS AND METHODS: In a randomized double-blind trial 378 male and female patients 50 years old or older with symptoms of overactive bladder (a urinary frequency of 8 or more voids per 24 hours with urgency and/or urge incontinence, that is 1 or more urge incontinence episodes per 24 hours) received 10 weeks of treatment with 2 mg. tolterodine twice daily/or an initial dose of 2.5 mg. oxybutynin twice daily, increasing to 5 mg. twice daily after 2 weeks of treatment. The main outcome measures were changes in voiding diary variables combined with detailed tolerability-safety assessments. RESULTS: Patients treated with tolterodine had significantly fewer adverse events (69% versus 81%, p = 0.01), notably dry mouth (37% versus 61%, p <0.0001), as well as a lower incidence of dose reduction (6% versus 25%, p <0.0001) than those in the oxybutynin group. Each agent had comparable efficacy for improving urinary symptoms. Tolterodine and oxybutynin caused a significant decrease (p = 0.0001) in the mean number of voids per 24 hours (-1.7 or -15% and -1.7 or -15%, respectively), urge incontinence episodes per 24 hours (-1.3 or -54% and -1.8 or -62%, respectively) and mean voided volume per void (33 ml. or 22% and 34 ml. or 23%) after 10 weeks of treatment. CONCLUSIONS: Tolterodine is as effective as oxybutynin for improving the symptoms of overactive bladder but it has superior tolerability. The combination of these qualities makes tolterodine the preferred pharmacological therapy for the long-term treatment of this condition.
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