2014
DOI: 10.1002/cpdd.95
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Pharmacokinetics and comparative bioavailability of allopurinol formulations in healthy subjects

Abstract: Allopurinol is the most commonly used urate-lowering therapy in gout. This study was undertaken to evaluate the pharmacokinetics and relative bioavailability of two brands of allopurinol tablets. The in vivo study was established according to a single-center, randomized, single-dose, laboratory-blinded, Two Way, Cross-Over Study with a washout period of 1 week. Under fasting conditions, 24 healthy male volunteers were randomly allocated to receive a single oral dose (200 mg) of either test and reference formul… Show more

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Cited by 3 publications
(7 citation statements)
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“…On the other hand, when the percentage of methanol was reduced to 5%, adequate retention and better peak response was observed for both allopurinol and acyclovir. This result obtained was in agreement with previous studies 37,9,10,12 where high percentage of aqueous solution was used for mobile phase preparation. Allopurinol is a polar compound, 1,20,21 with reported Log P of 0.28 10,22 and thus higher percentage of aqueous solution is needed for the retention of allopurinol in C 18 analytical column.…”
Section: Resultssupporting
confidence: 93%
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“…On the other hand, when the percentage of methanol was reduced to 5%, adequate retention and better peak response was observed for both allopurinol and acyclovir. This result obtained was in agreement with previous studies 37,9,10,12 where high percentage of aqueous solution was used for mobile phase preparation. Allopurinol is a polar compound, 1,20,21 with reported Log P of 0.28 10,22 and thus higher percentage of aqueous solution is needed for the retention of allopurinol in C 18 analytical column.…”
Section: Resultssupporting
confidence: 93%
“…3,12 Two common plasma sample preparation used for the quantification of allopurinol in biological matrix were liquid-liquid extraction (LLE) 3,8,11 and protein precipitation (PPT) techniques. [4][5][6][7]9,10,12 When liquid-liquid extraction (LLE) method was applied in the sample preparation of human plasma for bioequivalence studies of allopurinol, 3,8 the recovery (extraction efficiency) value of ≤ 65% was unsatisfactory. 3,8,14 LLE method was not suitable for polar compound due to strong binding between polar compound and the plasma proteins, which could impede complete drug removal by organic solvents.…”
Section: Methods Developmentmentioning
confidence: 99%
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“…Bioavailability is a very important parameter as it dictates the solid dosage form based on the extent of the metabolism of a drug. ALO in a commercial tablet dosage form (Zyloprim 300 mg) exhibits an absolute bioavailability of 67 ± 23% with a maximum peak plasma concentration ( C max ) within an hour. , It is anticipated that the enhanced dissolution/diffusion profile of ALO salts may improve the pharmacokinetic profile of the native drug. The pharmacokinetics of ALO and its salt hydrates was examined on healthy BALB/c mice following oral administration of 30 mg/kg dose, and bioavailability was accessed by measuring the C max and AUC using UPLC-MS/MS.…”
Section: Resultsmentioning
confidence: 99%