SPL Set ID: 6775241b-9703-4876-88fd-bbeb906f789d

Tetrabenazine is a monoamine depletor for oral administration. The molecular weight of tetrabenazine is 317.43; the pKa is 6.51. Tetrabenazine is a hexahydro-dimethoxy-benzoquinolizine derivative and has the following chemical name: cis rac –1,3,4,6,7,11bhexahydro-9,10-dimethoxy-3-(2-methylpropyl)-2H-benzo[a]quinolizin-2-one. The molecular formula C 19 H 27 NO 3 is represented by the following structural formula: Tetrabenazine is off-white to pale yellow powder that is sparingly soluble in methanol and soluble in chloroform. Each tetrabenazine tablet contains either 12.5 or 25 mg of tetrabenazine as the active ingredient. Tetrabenazine tablets contain tetrabenazine as the active ingredient and the following inactive ingredients: lactose monohydrate, ferric oxide yellow, corn starch, pregelatinized starch, magnesium stearate and talc. The 12.5 mg tetrabenazine tablets are light yellow to yellow colored, round, flat faced beveled edge, non-scored tablets debossed with ‘T1’ on one side and plain on other side. The 25 mg tetrabenazine tablets are light yellow to yellow colored, round, flat faced beveled edge, functionally scored tablets debossed with ‘T’ on both side of scored line and plain on other side. structure