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A randomized, double-blind, placebo-controlled, pharmacokinetic and pharmacodynamic study of a fixed-dose combination of phentermine/topiramate in adolescents with obesity.
Diabetes, Obesity and Metabolism ( IF 5.8 ) Pub Date : 2019-11-06 , DOI: 10.1111/dom.13910
Daniel S Hsia 1 , Nathalie H Gosselin 2 , Jenna Williams 3 , Nada Farhat 2 , J F Marier 2 , Winnie Shih 4 , Craig Peterson 4 , Robert Siegel 3
Affiliation  

AIMS To assess the pharmacokinetic (PK) and pharmacodynamic characteristics of VI-0521, a fixed-dose combination of immediate-release phentermine (PHEN) and extended-release topiramate (TPM) in adolescents aged 12 to 17 years with obesity, and to report weight loss and adverse events using this drug combination. MATERIALS AND METHODS This was a multicentre, randomized, double-blind, parallel-design, placebo-controlled study in adolescents with obesity. A total of 42 adolescents were randomly assigned in a 1:1:1 ratio to placebo, or to a mid-dose (PHEN/TPM 7.5 mg/46 mg), or a top-dose (PHEN/TPM 15 mg/92 mg) of VI-0521. A total of 26 adolescents were included in the PK analysis (14 from the mid-dose group and 12 from the top-dose group). RESULTS On day 56, arithmetic means of terminal elimination half-life, apparent clearance (CL/F) and apparent central volume of distribution (Vc/F) were consistent across dose levels for both PHEN and TPM. Arithmetic means of CL/F and Vc/F for PHEN and TPM administered as a combination in adolescents with obesity were within 10% to 30% of those previously assessed in adults with obesity enrolled in phase II and III studies. A higher proportion of adolescents in both the mid- and top-dose groups (13.3% and 50.0%, respectively) compared with placebo (0.0%) reached ≥5% weight loss at day 56. The least squares (LS) mean change in systolic blood pressure from baseline to day 56 was -5.2 mmHg for the placebo group, -2.5 mmHg for the mid-dose group, and - 5.5 mmHg for the top-dose group. The LS mean change in diastolic blood pressure from baseline to day 56 was -2.4 mmHg for the placebo group, +3.8 mmHg for the mid-dose group, and + 2.0 mmHg for the top-dose group. Participants in the top-dose group had increases in heart rate from baseline of 4.1 bpm, while participants in the mid-dose group experienced a mean decrease in heart rate of 4.5 bpm at day 56. Both PHEN/TPM dose combinations were safe and well tolerated. CONCLUSIONS Treatment of adolescents with obesity using a fixed-dose combination of PHEN/TPM for 8 weeks resulted in exposure to PHEN and TPM that was comparable to that observed in adults, statistically significant weight loss, and a tolerable safety profile. These data indicate that both mid- and top-dose levels are appropriate for longer-term safety and efficacy studies in adolescents.

中文翻译:

一项随机、双盲、安慰剂对照、药代动力学和药效学研究,研究固定剂量的芬特明/托吡酯联合治疗肥胖青少年。

目的 评估 VI-0521(一种速释芬特明(PHEN)和缓释托吡酯(TPM)的固定剂量组合)在 12 至 17 岁肥胖青少年中的药代动力学(PK)和药效学特征,并报告使用这种药物组合的体重减轻和不良事件。材料和方法 这是一项针对肥胖青少年的多中心、随机、双盲、平行设计、安慰剂对照研究。共有 42 名青少年以 1:1:1 的比例随机分配到安慰剂组、中剂量组(PHEN/TPM 7.5 mg/46 mg)或最高剂量组(PHEN/TPM 15 mg/92 mg ) 的 VI-0521。PK 分析共包括 26 名青少年(中剂量组 14 名,高剂量组 12 名)。结果在第 56 天,终末消除半衰期的算术平均值,表观清除率 (CL/F) 和表观中心分布容积 (Vc/F) 在 PHEN 和 TPM 的剂量水平上是一致的。PHEN 和 TPM 在肥胖青少年中联合给药的 CL/F 和 Vc/F 的算术平均值与之前在 II 期和 III 期研究中对肥胖成人进行评估的结果相差 10% 至 30%。与安慰剂组(0.0%)相比,中剂量组和最高剂量组中较高比例的青少年(分别为 13.3% 和 50.0%)在第 56 天达到 ≥5% 的体重减轻。安慰剂组从基线到第 56 天的收缩压为 -5.2 mmHg,中剂量组为 -2.5 mmHg,最高剂量组为 -5.5 mmHg。安慰剂组从基线到第 56 天舒张压的 LS 平均变化为 -2.4 mmHg,+3。中剂量组为 8 mmHg,最高剂量组为 + 2.0 mmHg。最高剂量组参与者的心率从基线增加 4.1 bpm,而中等剂量组参与者在第 56 天时心率平均下降 4.5 bpm。两种 PHEN/TPM 剂量组合都是安全且良好的容忍。结论 使用 PHEN/TPM 的固定剂量组合治疗 8 周的肥胖青少年导致 PHEN 和 TPM 的暴露与成人中观察到的相当,具有统计学意义的体重减轻和可耐受的安全性。这些数据表明,中剂量和最高剂量水平都适用于青少年的长期安全性和有效性研究。而中等剂量组的参与者在第 56 天时心率平均下降 4.5 bpm。两种 PHEN/TPM 剂量组合都是安全且耐受性良好的。结论 使用 PHEN/TPM 的固定剂量组合治疗 8 周的肥胖青少年导致 PHEN 和 TPM 的暴露与成人中观察到的相当,具有统计学意义的体重减轻和可耐受的安全性。这些数据表明,中剂量和最高剂量水平都适用于青少年的长期安全性和有效性研究。而中等剂量组的参与者在第 56 天时心率平均下降 4.5 bpm。两种 PHEN/TPM 剂量组合都是安全且耐受性良好的。结论 使用 PHEN/TPM 的固定剂量组合治疗 8 周的肥胖青少年导致 PHEN 和 TPM 的暴露与成人中观察到的相当,具有统计学意义的体重减轻和可耐受的安全性。这些数据表明,中剂量和最高剂量水平都适用于青少年的长期安全性和有效性研究。结论 使用 PHEN/TPM 的固定剂量组合治疗 8 周的肥胖青少年导致 PHEN 和 TPM 的暴露与成人中观察到的相当,具有统计学意义的体重减轻和可耐受的安全性。这些数据表明,中剂量和最高剂量水平都适用于青少年的长期安全性和有效性研究。结论 使用 PHEN/TPM 的固定剂量组合治疗 8 周的肥胖青少年导致 PHEN 和 TPM 的暴露与成人中观察到的相当,具有统计学意义的体重减轻和可耐受的安全性。这些数据表明,中剂量和最高剂量水平都适用于青少年的长期安全性和有效性研究。
更新日期:2019-12-19
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