Abstract
Flurbiprofen and its main acidic metabolites were detected in equine urine after a single-dose administration of 500 mg flurbiprofen to two 2.5–3.5-years-old mares, in order to be used in equine doping control routine analysis. The urine levels of the parent drug were determined using GC/MS. Five acidic metabolites were found in the urine. The structure of the proposed metabolites was confirmed by HRMS accurate mass measurements. The highest flurbiprofen concentration was 204 μg ml −1 at 1–3 h post administration. Flurbiprofen could be detected for 24–37 h in urine using the standard screening procedure. All metabolites were present 25 h post administration, while 4′-hydroxyflurbiprofen could be traced for more than 48 h and it is regarded as the long-term metabolite of flurbiprofen in horse.
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