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Tetrabenazine (TBZ) activity is thought to result from four isomeric dihydrotetrabenazine (HTBZ) metabolites ([+]-α-HTBZ, [-]-α-HTBZ, [+]-β-HTBZ, [-]-β-HTBZ). Each isomer has a unique profile of vesicular monoamine transporter 2 (VMAT2) inhibition and off-target binding. Previously published data only report total isomer (α) and (β) concentrations. We developed a method to quantify the individual HTBZ isomers in samples from patients with Huntington's disease receiving TBZ. For comparison, concentrations of [+]-α-HTBZ, the single active metabolite shared by valbenazine (VBZ) and TBZ, were determined in samples from patients with tardive dyskinesia receiving VBZ.

Differences in Dihydrotetrabenazine Isomer Concentrations Following Administration of Tetrabenazine and Valbenazine