Combination Treatment With Doxazosin Plus TolterodineSR 2 mg Versus 4mg in Men With an Overactive Bladder (OAB) and Benign Prostatic Hyperplasia (BPH)

Study Overview
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Brief Summary
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OAB occurs in approximately 50% to 75% of men with BPO and up to 38% of men with BPO continue to suffer from OAB after relief the obstruction.Symptoms of OAB are more bothersome than the voiding complaints of slow stream and hesitancy. However, the patients with both BPO and OAB are often not treated with muscarinic receptor antagonists due to concern that they will experience acute urinary retention. Tolterodine is a potent and pure muscarinic receptor antagonist that was developed specifically for the treatment of overactive bladder. Recently, studies revealed that tolterodine was effective, safe and well tolerated in adults with OAB and urodynamically confirmed BPO.However, the optimal dosage of antimuscarinic for the treatment of OAB coexisting BPO was not yet fully assessed. In real clinical situation, some patients complain voiding difficulty after addition of antimuscarinics and want to stop antimuscarinics.It is probable that a lower dosage of antimuscarinics combined with alpha-adrenergic antagonists can be used safely in OAB patients with BOO, with the same efficacy. This study is designed to investigate the optimal doses of tolterodine SR in combination with doxazosin in men with both BOO and OAB based on efficacy, safety, and tolerability.

Official Title
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Comparison of the Efficacy and Safety of Combination Treatment With Doxazosin Plus TolterodineSR 2 mg vs Doxazosin Plus TolterodineSR 4 mg in Men With an OAB/BPO: Randomized Controlled Study

Conditions
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Overactive Bladder, Benign Prostatic Hyperplasia

Intervention / Treatment
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* Drug: doxazosin plus tolterodine SR


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male aged 50 ≤ and ≤ 80 years Proven bladder outlet obstruction (BOO, Abrams/Griffith score >20) on urodynamic study Symptoms of OAB as verified by the 3 day voiding diary, defined by: symptoms of urinary urgency (defined as a level of ≥3 in a 5 point urgency scale) at least two episode per 24 hours and symptoms of urinary frequency (8 micturitions per 24 hours) Total International Prostate Symptom Score (IPSS) of 12 or higher IPSS quality-of-life (QOL) item score of 3 or higher A rating of the bladder condition at Baseline prior to randomization as Some Moderate Problems, Severe Problems, or Many Severe Problems on the Patient Perception of Bladder Condition (PPBC) questionnaire. Ability and willingness to correctly complete the micturition diary and questionnaire Capable of understanding and having signed the informed consent form after full discussion of the research nature of the treatment and its risks and benefits Exclusion Criteria: Patients have a baseline post-void residual (PVR) which exceeded 150 mL. Any condition that is a contraindication for anticholinergic treatment, including uncontrolled narrow-angled glaucoma, urinary retention or gastric retention. Symptomatic acute urinary tract infection (UTI) during the screening period. Treatment within the 14 days preceding randomization, or expected to initiate treatment during the study with any anticholinergic drugs and drug treatment for overactive bladder. A 5-alpha reductase inhibitor if started less than 3 months prior to screening. Patients with previous urethral, prostate or bladder neck surgery. Patients with cancer of any type including cancer of the prostate or bladder, uncontrolled medical condition including psychiatric disease or life threatening illness. Patients with Parkinson's disease, stroke, multiple sclerosis, spinal cord disease. Patients with suspected neurogenic bladder disorder. Patients with urethral stricture or bladder neck contracture. Serum PSA 4ng/ml (only patients with no malignancy by prostate biopsy can be included).

Ages Eligible for Study
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Minimum Age: 50 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: doxazosin plus tolterodine SR 2 mg<br>doxazosin plus tolterodine SR(2 mg, qd) for 12 weeks | Drug: doxazosin plus tolterodine SR<br>* doxazosin plus tolterodine SR(2 mg, qd)for 12 weeks or (4 mg, qd) for 12 weeks<br>* Other names: Detrusitol SR 2mg;|
| Experimental: doxazosin plus tolterodine SR 4 mg<br>doxazosin plus tolterodine SR(4 mg,qd) for 12 weeks | Drug: doxazosin plus tolterodine SR<br>* doxazosin plus tolterodine SR(2 mg, qd)for 12 weeks or (4 mg, qd) for 12 weeks<br>* Other names: Detrusitol SR 2mg;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Numeric change of urgency episodes per 24 hours |  | 12 weeks of treatment | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes in voiding diary parameters |  | 12 weeks of treatment | 
| Change in symptom questionnaires |  | 12 weeks | 
| Patient-Rated Global Assessments of Treatment Benefit, Satisfaction, and Willingness to Continue |  | 12 weeks | 
| Change of uroflowmetry and PVR |  | 12 weeks | 
| Incidence of acute urinary retention |  | during all study periods | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Overactive bladder, Benign prostate hyperplasia, Doxazosin, Tolterodine