A Study Comparing the Efficacy and Safety of OROS® Oxybutynin to That of Ditropan® (Immediate-release Oxybutynin) for the Treatment of Patients With Urge or Mixed Urinary Incontinence.

Study Description

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Brief Summary:

The purpose of this study is to compare the efficacy and safety of OROS® oxybutynin to that of Ditropan® (immediate-release oxybutynin) for the treatment of patients with urge or mixed urinary incontinence. Oxybutynin is an antispasmodic, anticholinergic medication for the treatment of the symptoms of overactive bladder.

Condition or disease	Intervention/treatment	Phase
Urge Incontinence	Drug: OROS® oxybutynin or Ditropan®	Phase 3

Detailed Description:

Ditropan® is indicated for the treatment of urge urinary incontinence, however patients tend to discontinue the medication or decrease the dose due to anticholinergic side effects. OROS® oxybutynin, a continuous release formulation, is expected to have fewer anticholinergic side effects than Ditropan® and may provide equal or better efficacy compared to Ditropan®. This is a randomized, multi-center, double-blind, parallel group, dose-escalation study comparing the efficacy and safety of OROS® oxybutynin to Ditropan® for the treatment of urge or mixed urinary incontinence at the minimum effective dose (MED), the maximum tolerated dose (MTD), or the maximum allowable dose (MAD) permitted under this protocol. Patients in both treatment groups begin study drug treatment at an oxybutynin dose of 5 mg per day. The dose is changed in 5 mg increments at 4- to 7-day intervals, depending on the safety and efficacy of the current dose. The maximum allowable dose for Ditropan® is 20 mg per day, which is the maximum daily adult dose specified in its labeling. Because controlled delivery of oxybutynin by an OROS® dosage form could potentially reduce side effects, it is believed that the drug could possibly be tolerated at doses higher than 20 mg per day. Consequently, the maximum allowable dose for OROS® oxybutynin is 30 mg per day, administered as a single daily dose. The primary measures of effectiveness include the change from baseline in the following assessments: the number of urge urinary incontinence episodes per week, the total number of urinary incontinence episodes, and total void frequency (normal and incontinent). Safety evaluations include the incidence of adverse events, physical examination and medical history, clinical laboratory tests, urinalysis, electrocardiograms (ECGs), vital signs, and the Anticholinergic Effects Assessment (ACEA) questionnaire.

OROS® (oxybutynin chloride) 5 mg tablets, one to six tablets per day (5 mg/day to 30 mg/day) as a single morning oral dose for 11 days up to 70 days, and Ditropan (oxybutynin chloride) 5 mg tablets, one to four tablets per day orally (5 mg per day to 5 mg four times per day) for 10 daysup to 61 days.

Study Design

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Study Type :	Interventional (Clinical Trial)
Enrollment :	100 participants
Allocation:	Randomized
Intervention Model:	Parallel Assignment
Masking:	Double
Primary Purpose:	Treatment
Official Title:	The Maximum Tolerated Dose and Minimum Effective Dose of OROS® Oxybutynin Compared to Ditropan® (Immediate-release Oxybutynin) in the Treatment of Patients With Urge or Mixed Urinary Incontinence
Study Start Date :	July 1996
Study Completion Date :	February 1997

Arms and Interventions

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Outcome Measures

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Primary Outcome Measures :

1. Change from baseline in: the number of urge urinary incontinence episodes per week; total number of urinary incontinence episodes; total void frequency (normal and incontinent)

Secondary Outcome Measures :

1. Incidence of adverse events

Eligibility Criteria

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Ages Eligible for Study:	40 Years to 75 Years (Adult, Senior)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	No

Criteria

Inclusion Criteria:

• Patients with urge or mixed urinary incontinence, provided that stress urinary incontinence is not the predominant manifestation of mixed urinary incontinence
• Patients who are currently taking immediate release oxybutynin (Ditropan®) hyoscyamine (Levsin®) or propantheline (Pro-banthine®), or who have taken Ditropan in the past for urge or mixed UI. (Patients who have taken Ditropan for urge or mixed urinary incontinence, but who have discontinued the medication should have discontinued due to anticholinergic effects and not due to failure of efficacy)
• Patients who are able to differentiate incontinent episodes associated with urgency from incontinent episodes not associated with urgency when recording incontinent episodes in the diary, who have at least six urge urinary incontinence episodes per week recorded on the Run-in Diary after washout of anticholinergic medications, and who demonstrate that the number of urge incontinent episodes per week is greater than the number of incontinent episodes not associated with urgency per week
• Patients who are in good general health prior to study participation, having normal blood pressure with or without hypertension medication
• Agreeing that a medically acceptable and effective birth control method will be used by the patient and partner throughout the study and for one week following the end of the study

Exclusion Criteria:

• Patients with known treatable genitourinary conditions that may cause incontinence (e.g., urinary tract infection, prostatitis, urinary tract obstruction, bladder tumor, bladder stone, prostate cancer)
• Patients with glaucoma or untreated narrow anterior chamber angles, obstructive bowel disease or severe narrowing of the gastrointestinal tract, obstructive uropathy, or myasthenia gravis
• Patients with known allergy or hypersensitivity to oxybutynin or clinically significant medical problems or other organ abnormality or pathology for whom, administration of oxybutynin would present undue risk
• Male patients with a PSA > 10 ng/mL or a PSA between 4 ng/mL and 10 ng/mL who in the opinion of the investigator require further evaluation or treatment for prostate cancer, or male patients who have had prostate surgery less than nine months before study enrollment. (Prostate pathology from surgery must be benign)
• Patients whose estimated creatinine clearance is less than 50 mL/min or a have hemoglobin level less than 10 g/dL

Contacts and Locations

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Sponsors and Collaborators

Alza Corporation, DE, USA

Investigators

Study Director:	Alza Corporation Clinical Trial	Alza Corporation, DE, USA

More Information

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Additional Information:

The maximum tolerated dose and minimum effective dose of OROS® oxybutynin compared to Ditropan® in the treatment of patients with urge or mixed urinary incontinence (UI) 

ClinicalTrials.gov Identifier:	NCT00269750 History of Changes
Other Study ID Numbers:	CR005968
First Posted:	December 26, 2005
Last Update Posted:	May 19, 2011
Last Verified:	April 2010

Keywords provided by Alza Corporation, DE, USA:

Ditropan®; OROS®; urge; oxybutynin; mixed urinary incontinence

Additional relevant MeSH terms:

Urinary Incontinence; Enuresis; Urinary Incontinence, Urge; Urination Disorders; Urologic Diseases; Lower Urinary Tract Symptoms; Urological Manifestations; Signs and Symptoms; Behavioral Symptoms; Elimination Disorders; Mental Disorders; Oxybutynin; Mandelic Acids	Parasympatholytics; Autonomic Agents; Peripheral Nervous System Agents; Physiological Effects of Drugs; Muscarinic Antagonists; Cholinergic Antagonists; Cholinergic Agents; Neurotransmitter Agents; Molecular Mechanisms of Pharmacological Action; Urological Agents; Anti-Infective Agents, Urinary; Anti-Infective Agents; Renal Agents