Fesoterodine Dose Response in Subjects With Overactive Bladder Syndrome

• Published in: Urology (Ridgewood, N.J.) Vol. 71; no. 5; pp. 839 - 843
• Main Authors: Khullar, Vik, Rovner, Eric S, Dmochowski, Roger, Nitti, Victor, Wang, Joseph, Guan, Zhonghong
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.05.2008; Elsevier Science
• Subjects: Adult; Aged; Aged, 80 and over; Benzhydryl Compounds - administration & dosage; Biological and medical sciences; Dose-Response Relationship, Drug; Female; Humans; Male; Medical sciences; Middle Aged; Nephrology. Urinary tract diseases; Urinary Bladder, Overactive - drug therapy; Urinary system involvement in other diseases. Miscellaneous; Urinary tract. Prostate gland; Urology; Human; Cholinergic receptor; Nephrology; Urinary system disease; Overactive bladder; Bladder disease; Muscarinic receptor; Antagonist; Urinary tract disease; Fesoterodine; Urology; Dose activity relation
• ISSN: 0090-4295; 1527-9995
• DOI: 10.1016/j.urology.2007.12.017

Objectives To compare the efficacy of fesoterodine 4 mg versus 8 mg in treating subjects with overactive bladder (OAB) syndrome. Methods This is a pooled analysis of data from 2 randomized placebo (PBO)-controlled phase III trials. Eligible subjects with frequency and urgency or urgency urinary incontinence (UUI) were randomized to PBO or fesoterodine 4 or 8 mg for 12 weeks. Subjects assessed efficacy using 3-day bladder diaries recording the time of each void, urgency, and incontinence episode. Endpoints included treatment response (based on a 4-point Treatment Benefit scale) and change from baseline in micturitions, UUI episodes, mean volume voided, urgency episodes, and continent days. We assessed tolerability and safety by evaluating adverse events, residual urine volume, laboratory parameters, and treatment withdrawals. Results At the end of treatment, both doses of fesoterodine showed statistically significant improvements in all efficacy endpoints versus PBO ( P <0.01). These effects were seen 2 weeks after initiation of treatment (the earliest evaluation point) and were sustained throughout the treatment period. Fesoterodine 8 mg performed significantly better than fesoterodine 4 mg in improving all diary variables ( P <0.05) except micturition frequency, demonstrating a dose–response relationship. Adverse events reported more frequently with fesoterodine than with PBO included dry mouth, constipation, and urinary tract infection. Conclusions Both fesoterodine 4 and 8 mg are effective in improving OAB symptoms. The higher 8-mg dose provides additional benefit compared with the lower dose in improving most bladder diary variables, thus offering the possibility of dose flexibility and titration.