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Solifenacin succinate is a novel muscarinic receptor antagonist used for the treatment of overactive bladder (OAB). We investigated the effects of solifenacin by oral and intravenous administration on carbachol (CCh)-induced intravesical pressure (IVP) elevation and compared its efficacy with that on CCh-induced salivary secretion in anesthetized mice. Additionally, we also investigated the change in effects between single and repeated oral administration of solifenacin on CCh-induced IVP elevation. Results showed that intravenous administration of solifenacin dose-dependently inhibited the IVP elevation and salivary secretion. The ratio of bladder response to salivary response (ratio of ID(50) values) was 2.1. Oral administration of solifenacin (0.3-30 mg/kg) also inhibited CCh-induced IVP elevation and salivary secretion. Although inhibition of these responses by solifenacin (10, 30 mg/kg) was comparable at early time points (0.5 and 1 h after administration at 10 mg/kg and 0.5 to 2 h after administration at 30 mg/kg), inhibition of CCh-induced IVP elevation was stronger at later time points (2 to 8 h after administration at 10 mg/kg and 4 to 24 h after administration at 30 mg/kg). No significant difference in ID(50) values for IVP elevation was observed between single and repeated (11 d) oral administration of solifenacin (1-30 mg/kg), suggesting no change in efficacy on chronic administration. In conclusion, intravenous and oral solifenacin inhibits CCh-induced IVP elevation more potently than salivary secretion. These results provide further evidence for the clinical use of solifenacin as a promising therapeutic drug for OAB with a low incidence of dry mouth.

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Effects of Intravenously and Orally Administered Solifenacin Succinate (YM905) on Carbachol-Induced Intravesical Pressure Elevation and Salivary Secretion in Mice