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• W2073481704 abstract "The anticonvulsant gabapentin is transported across biological membranes via the L-amino acid transport system (System-L). Absorption of gabapentin is saturable, and in-vitro data have previously demonstrated that both L-leucine and L-phenylalanine may compete with the intestinal transport of gabapentin. The purpose of this study therefore was to determine whether a high-protein meal would interfere with gabapentin absorption. Ten healthy volunteers received in a randomized, cross-over design, a single 600-mg dose of gabapentin in the fasting state and after a high-protein meal consisting of 80 gm total protein (4.1 g phenylalanine, 8.2 g leucine and 4.2 g isoleucine), 52 g carbohydrate, and 9 g fat. Plasma gabapentin concentrations were measured by HPLC at baseline, 0.25, 0.5, 0.75, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 8, 12, 24, 30 h. Calculated pharmacokinetic parameters included Cmax' Tmax' AUC and T1/2. In addition, a pharmacodynamic assessment (using visual analog scales) of gabapentin-related adverse effects was performed at 2 h post drug ingestion and was compared between study phases. Statistical analysis included Student's t-test for paired data, with significance assigned at P < 0.05. Cmax was significantly increased by 36% (3.87 +/- 1.15 vs 5.28 +/- .97 micrograms/ml, P = 0.002), and Tmax tended to be shorter (3.9 +/- 1.8 vs 2.8 +/- .35 h, P = 0.10), after the high-protein meal. Although AUC was increased by 11%, this did not achieve statistical significance. Despite significantly higher plasma concentrations at 2 h, subjects reported significantly fewer adverse effects after the high-protein meal. Potential mechanisms to explain these unexpected findings may be that the large amino acid load delivered with the high-protein meal enhanced gabapentin absorption via trans-stimulation, the process by which acutely increased intestinal luminal amino acid concentrations result in an acute up regulation in System-L activity. Conversely, the decrease in perceived adverse CNS effects of gabapentin following the high-protein meal may reflect CNS competition for System-L transport." @default.
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• W2073481704 date "1996-02-01" @default.
• W2073481704 modified "2023-10-07" @default.
• W2073481704 title "Effect of a high-protein meal on gabapentin pharmacokinetics" @default.
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• W2073481704 doi "https://doi.org/10.1016/0920-1211(95)00051-8" @default.
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