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Effects of different doses glimepiride intake on the pharmacokinetics of benzbromarone in rats.
Pakistan Journal of Pharmaceutical Sciences 2023 January
Benzbromarone (BNR) is prescribed for the management of hyperuricemia, whereas glimepiride (GLM) for the treatment of Type 2 Diabetes Mellitus. Both drugs are certified to be mainly metabolized via cytochrome P450 (CYP) 2C9 in vivo and may have the potential drug-drug interactions. This study aims to investigate the possible influence of orally administered low- and high-dose glimepiride (GLM) on pharmacokinetic characteristics (PK) of benzbromarone (BNR) in rats. Fifteen rats were randomly assigned to group A, B and C (n=5) and administered 0.5% sodium carboxymethyl cellulose (CMC), 0.5mg/kg GLM (low-dose) and 1.0 mg/kg GLM (high-dose) once daily for 8 days, respectively, which were all followed with a single oral dose of BNR (9.0 mg/kg) on the day 8th. Blood samples were obtained from retro orbital plexus at the time points of 0.25, 0.5, 1, 2, 4, 6, 8, 10, 12 and 24h and BNR in plasma was quantitated by HPLC-MS/MS assay. Resultantly a slight influence of GLM on PK of BNR could be found in rats. When compared with Group A, the half-life time (t1/2z) of BNR in Group B and C significantly decreased 52.39% and 73.49%, respectively, although other major PK parameters were negligibly changed by co-administration of GLM. On the whole, the combinational therapy of GLM at low or high dose would notably alter the elimination of BNR and the effect was dose-dependent.
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