Oxybutynin for detrusor instability with adjuvant salivary stimulant pastilles to improve compliance: results of a multicentre, randomized controlled trial

• Published in: BJU international Vol. 85; no. 4; pp. 416 - 420
• Main Authors: Tincello, D.G., Adams, E.J., Sutherst, J.R., Richmond, D.H.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 01-03-2000; Blackwell
• Subjects: Adult; Aged; Biological and medical sciences; Cholinergic Antagonists - therapeutic use; Detrusor instability; Drug Combinations; Drug toxicity and drugs side effects treatment; drugs; Female; Humans; Mandelic Acids - therapeutic use; Medical sciences; Middle Aged; Patient Compliance; Pharmacology. Drug treatments; randomized controlled trial; Tablets; Toxicity: respiratory system, ent, stomatology; treatment; Urinary Incontinence - drug therapy; Human; Stimulant; Urinary system disease; Hyperreactivity; Urinary tract disease; Oral cavity; Salivary gland disease; Antispasmodic agent; Detrusor muscle; Complication; Instability; Oral cavity disease; Bladder disease; Oxybutynin; Combined treatment; Drought; Saliva
• ISSN: 1464-4096; 1464-410X
• DOI: 10.1046/j.1464-410x.2000.00520.x

Objective To test the hypothesis that compliance with oxybutynin would be improved if the severity of dry mouth could be reduced, thus leading to improved urinary symptom response and improved outcome, in a randomized, controlled trial of oxybutynin with or without salivary stimulant pastilles in patients with detrusor instability.
Patients and methods Sixty‐seven women with detrusor instability were randomized to a variable dose regimen of oxybutynin with (37) or without (30) salivary stimulant pastilles for 8 weeks. Patients were asked to complete a baseline voiding diary. In weeks 1 and 2, patients were encouraged to adjust the dose of oxybutynin themselves to achieve optimum symptomatic control. A second diary was completed in the sixth week and patients were reviewed at 8 weeks. The outcome measures were the compliance rate, follow‐up attendance rate, maximum dose of medication, changes in voiding and incontinence episodes, and changes in severity of urgency and of dry mouth symptoms between the first and sixth week.
Results Of the 67 women, 32 (47%) completed the study; the proportion completing was the same in both groups. Four patients had stopped the medication and there was no difference in the distribution of maximum dosage achieved between the groups. Both groups reported a reduced severity of urgency symptoms and increased severity of dry mouth. There were no differences in reported symptom change between the groups during the study.
Conclusions The combination of oxybutynin and salivary stimulant pastilles does not improve compliance or symptom relief compared with oxybutynin alone; it does not allow a greater dose of oxybutynin to be tolerated.