Aims: To determine efficacy of the analgesic flupirtine in the treatment of overactive bladder syndrome in a proof-of-concept study.

Methods: Double-blind, double-dummy, three-armed comparison of flupirtine extended release (400 mg/day, titrated to 600 mg/day), tolterodine extended release (4 mg/day) and placebo for 12 weeks.

Results: When major elevations of liver enzymes (more than three times the upper normal limit) were detected in several flupirtine-exposed patients, the study was prematurely discontinued. Based on study-end data, hepatotoxicity was detected in 31% of patients receiving flupirtine for ≥ 6 weeks.

Conclusions: Unexpected frequent and relevant toxicity can occur when testing an established drug for a new indication.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3403210PMC
http://dx.doi.org/10.1111/j.1365-2125.2011.04138.xDOI Listing

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