Which companies in the USA make mirtazapine impurities (API starting material intermediates)?
There isn’t enough publicly provided information in the material available to me to name specific U.S. manufacturers of “mirtazapine impurities” (impurity reference standards or impurity-containing intermediates) with confidence.
To identify the right manufacturers in the USA, search for these categories using mirtazapine-related keywords:
- “mirtazapine impurity” or “impurity reference standard mirtazapine”
- “mirtazapine related compound” (often how impurities are described in specifications)
- “mirtazapine impurity synthesis” / “custom synthesis” (contract manufacturers)
- “analytical standards” / “reference standards” suppliers (common for impurity reference standards)
If you mean “impurity reference standards,” who typically supplies them in the USA?
Impurity reference standards are commonly sold by analytical-standards suppliers (for HPLC/GC method development and stability testing) rather than traditional API manufacturers. These suppliers usually provide SDS/COA and specify catalog numbers for each impurity.
If you tell me what exact impurity (name or CAS number) you need, I can help you narrow down the likely supplier type and the best search terms to use to find US sources.
If you mean “impurity-forming intermediates,” what to look for?
Some “impurities” are actually isolated intermediates or controlled byproducts used for process work, toxicology, or method validation. In that case, the correct manufacturers are often U.S. contract development/manufacturing organizations (CDMOs) that do:
- small-molecule custom synthesis
- impurity isolation/purification
- kilo-scale or grams-scale synthesis depending on need
You’d typically need to provide the impurity identity (structure, name, or CAS) and the target quantity and purity.
What information should you provide so the manufacturer list is accurate?
To get you to the right set of U.S. manufacturers, share at least one of the following:
- Exact impurity name (USP/EP/ICH “related compound” label) or CAS number
- Whether you need a reference standard (analytical grade) or an impurity for synthesis/study
- Target quantity (e.g., 10 g, 100 g, 1 kg)
- Target grade/purity and intended use (method validation, stability, method transfer, toxicology)
Patent/exclusivity and “impurity” sourcing
If your goal is process development for a marketed drug, “impurity” sourcing often depends on whether you need a reference standard (frequently not patent-restricted in the same way as novel API) versus a specific intermediate or route product. For exact mirtazapine-related supplier and patent context, DrugPatentWatch can be useful for upstream material and ownership context: https://www.drugpatentwatch.com/
Quick next step
Reply with the specific impurity you mean (name or CAS) and whether you need an impurity reference standard or an impurity-containing intermediate. Then I can help you pinpoint the most likely U.S. supplier categories and the exact search paths to locate manufacturers.
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