Trospium chloride is a muscarinic antagonist urinary antispasmodic. Trospium chloride was not teratogenic at statistically significant levels in rats or rabbits administered doses up to 200 mg/kg/day. This corresponds to systemic exposures up to approximately 9 and 16 times, respectively (based on AUC), the clinical exposure at the maximum recommended human dose (MRHD) of 40 mg. However, in rabbits, one fetus in each of the three treated dose groups (0.5, 0.3, and 16 times the exposures at the MRHD) demonstrated multiple malformations, including umbilical hernia and skeletal malformations. A no effect level (20 mg/kg/day in rats and rabbits) for maternal and fetal toxicity was observed at levels approximately equivalent to the clinical exposure at the MRHD. Trospium chloride should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.
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