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[Investigation of pharmacokinetics of crushed imidafenacin 0.1-mg tablet after single oral administration in healthy men].

The crushing of tablets and opening of capsules should not be performed without proper care, as these actions may adversely affect the pharmaceutical release mechanisms. However, various clinical circumstances occasionally necessitate these actions. The long-term stability of the commercial formulation of imidafenacin was confirmed after crushing of tablets. For the safe administration of crushed imidafenacin tablets, we examined the pharmacokinetics of crushed imidafenacin 0. 1-mg tablet after single oral administration in healthy men. Plasma concentrations were measured in 6 male volunteers (age, 33.3 ± 10.6 years) orally administered crushed imidafenacin under fasting conditions. Imidafenacin was rapidly absorbed and plasma concentrations peaked (Cmax) at 414 ± 108 pg/ml after 1.5 h (Tmax ; median), after which the drug was rapidly eliminated with a half-life (t1/2) of 2.8 ± 0. 3 h. Area under the plasma concentration-time curve (AUC0-10) was 1,680 ± 334 pg･h/ml. There were no significant differences in Cmax, Tmax and t1/2 between the crushed and tablet medications. Thus, crushing has almost no influence on the pharmacokinetics of imidafenacin. Consequently, this study was made available as information for patients requiring crushed anticholinergic agents.