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Lamotrigine does not prolong QTc in a thorough QT/QTc study in healthy subjects.

Author(s): Dixon R, Job S, Oliver R, Tompson D, Wright JG, Maltby K, Lorch U, Taubel J

Affiliation(s): Department of Clinical Pharmacology and Discovery Medicine, Discovery Biometrics, GlaxoSmithKline, Harlow, UK.

Publication date & source: 2008-09, Br J Clin Pharmacol., 66(3):396-404. Epub 2008 Jul 23.

Publication type: Randomized Controlled Trial; Research Support, Non-U.S. Gov't

AIM: To characterize the effects of lamotrigine on QT interval in healthy subjects. METHODS: Healthy subjects received a single oral dose of moxifloxacin (400 mg) or placebo in crossover design, followed by a dose-escalating regimen of lamotrigine (n = 76) over a 77-day period, or matched placebo (n = 76). Blood samples were taken for determination of moxifloxacin and lamotrigine concentrations and digital 12-lead ECGs were recorded. The relationships between individual QT values and respective individual moxifloxacin or lamotrigine concentrations were explored using population pharmacokinetic-pharmacodynamic (PK-PD) modelling. RESULTS: Moxifloxacin was associated with a maximum mean increase from baseline in QTcF of 14.81 ms [90% confidence interval (CI) 13.50, 16.11] 2.5 h after dosing. Steady-state exposure to lamotrigine (50, 150 or 200 mg b.d.) was not associated with an increase in QTc interval. Small reductions in QTcF (maximum mean difference from placebo -7.48 ms, 90% CI -10.49, -4.46) and small increases in heart rate (maximum mean difference from placebo 5.94 bpm, 90% CI 3.81, 8.06) were observed with lamotrigine 200 mg b.d. vs. placebo. No effect of lamotrigine on QRS duration or blood pressure was observed. No outliers with QTcF > 450 ms, or with an increase from baseline of >60 ms were observed in the lamotrigine group. PK-PD modelling indicated statistically significant decreases in individually corrected QT intervals for lamotrigine and statistically significant increases in individually corrected QT intervals for moxifloxacin over the concentration ranges studied. CONCLUSIONS: Therapeutic doses of lamotrigine (50-200 mg b.d.) were not associated with QT prolongation in healthy subjects.

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