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The enantioselectivity of the pharmacokinetics of methadone was investigated in anesthetized Shetland ponies after a single intravenous (0.5 mg/kg methadone hydrochloride;  n  = 6) or constant rate infusion (0.25 mg/kg bolus followed by 0.25 mg/kg/h methadone hydrochloride;  n  = 3) administration of racemic methadone. Plasma concentrations of  l ‐methadone and  d ‐methadone and their major metabolites,  l ‐ and  d ‐2‐ethylidene‐1,5‐dimethyl‐3,3‐diphenylpyrrolidine (EDDP), respectively, were analyzed by CE with highly sulfated γ‐cyclodextrin as chiral selector and electrokinetic analyte injection from liquid/liquid extracts prepared at alkaline pH. In both trials, the  d ‐methadone concentrations were lower than those of  l ‐methadone and the  d ‐EDDP levels were lower than those of L‐EDDP. For the case of a single intravenous bolus injection, the plasma concentration versus time profile of methadone enantiomers was analyzed with a two‐compartment pharmacokinetic model.  l ‐methadone showed a slower elimination rate constant, a lower body clearance, and a smaller steady‐state volume of distribution than  d ‐methadone.  d ‐methadone and  d ‐EDDP were eliminated faster than their respective  l ‐enantiomers. This is the first study that outlines that the disposition of racemic methadone administered to anesthetized equines is enantioselective.

Stereoselective methadone disposition after administration of racemic methadone to anesthetized Shetland ponies assessed by capillary electrophoresis