Deutetrabenazine API Suppliers & Bulk Manufacturers

Available Forms: API (drug substance)

Available Strengths: USP grade or in-house specification

Reference Brands: Austedo, Austedo XR

Category: Active Pharmaceutical Ingredient

Deutetrabenazine is a deuterated VMAT2 inhibitor used for Huntington's chorea and tardive dyskinesia. It is sourced by generic formulators, CDMOs and R&D teams.

Product Description:

Deutetrabenazine is a version of tetrabenazine in which the six hydrogen atoms on its two methoxy groups are replaced with deuterium, which slows its breakdown in the body. Like tetrabenazine it inhibits vesicular monoamine transporter 2 (VMAT2), reducing the release of dopamine in the brain. It is approved in the US for adults with chorea associated with Huntington's disease and with tardive dyskinesia (reference brand: Austedo, Austedo XR).

Specification at a glance

Regulatory files and timing

The FDA list of Drug Master Files (third quarter 2026) shows 7 active Type II API DMFs for this molecule. Few filings usually means few qualified sources, so early contact with suppliers pays off. For Europe, ask whether the supplier holds a CEP or an EU ASMF and, for imports into the EU, a written confirmation.

Generic or biosimilar entry. United States: Entry expected (Apr 2033 (settlements)). European Union: No confirmed date.

Handling and quality points

The extra test that sets deutetrabenazine apart is isotopic purity: ask how the supplier measures deuterium incorporation and limits partly deuterated species, usually by mass spectrometry or NMR. Stereochemistry needs control too, since the drug is the racemic RR/SS pair and the other diastereomers count as impurities. The finished product must be protected from light and moisture, so check the drug substance stability data on the same points.

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Brand names are trademarks of their respective owners and identify the reference medicine only. Information is general and was checked in October 2026; confirm specifications and filings with the supplier before purchase.