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Pharmacokinetics of the antiarrhythmic agent tiracizine: steady state kinetics in comparison with single-dose kinetics.
Berndt, A; Oertel, R; Terhaag, B; Richter, K; Gramatté, T.
Afiliação
  • Berndt A; Institute of Clinical Pharmacology, Medical Faculty, Technical University, Dresden, Germany.
Biopharm Drug Dispos ; 16(5): 427-41, 1995 Jul.
Article em En | MEDLINE | ID: mdl-8527691
ABSTRACT
Serum and urine kinetics of unchanged tiracizine (T), a new class I antiarrhythmic agent, and three metabolites (M1, 2, and 3) were assessed in eight healthy extensive metabolizers after a single oral administration of 50 mg tiracizine and during steady state (50 mg b.i.d.). Additionally, tiracizine-induced ECG changes were measured. Considerable accumulation of M1 and M2 was observed during repeated dosing (M1, Cmax,ss = 391.8 ng mL-1 against Cmax,sd = 132.8 ng mL-1; M2, Cmax,ss = 143.2 ng mL-1 against Cmax,sd = 25.8 ng mL-1). However, significant increases of AUC (AUC tau = 261.9 ng h mL-1 against AUC0-infinity,sd = 182.9 ng h mL-1), Cmax (Cmax,ss = 75.9 ng mL-1 against Cmax,sd = 56.9 ng mL-1) and t 1/2 beta (t 1/2 beta,ss = 4.0 h against t 1/2 beta,sd = 2.4 h) of the parent compound indicate non-linear kinetics. The significant decrease in renal clearance of all four substances as well as the decrease of non-renal tiracizine clearance with repeated dosing led to the assumption that non-linearity is due to saturable renal excretion and a fall in intrinsic tiracizine clearance. PQ time was prolonged significantly during steady state and culminated at the tmax of the parent compound, whereas there was no change in any ECG parameter after a single-dose administration of 50 mg tiracizine.
Assuntos
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Base de dados: MEDLINE Assunto principal: Dibenzazepinas / Antiarrítmicos Idioma: En Ano de publicação: 1995 Tipo de documento: Article
Buscar no Google
Base de dados: MEDLINE Assunto principal: Dibenzazepinas / Antiarrítmicos Idioma: En Ano de publicação: 1995 Tipo de documento: Article