HS 293372 Clobazam (INN) and methyprylon (INN)

Quick Answer: HS code 293372 specifically covers Clobazam and Methyprylon, both International Nonproprietary Names (INN) for pharmaceutical substances. Clobazam is a benzodiazepine used as an anxiolytic and anticonvulsant, while Methyprylon is a sedative-hypnotic. These are active pharmaceutical ingredients (APIs) or bulk drug substances, not finished dosage forms. For importers and exporters, understanding the specific duty rates is crucial. In the UK and EU, the applied duty rate for products classified under 293372 is 0.00% ad valorem, indicating duty-free entry. Conversely, the United States imposes a more complex duty structure, with a "Free" rate for certain origins, but also a potential rate of 15.4¢/kg + 52% ad valorem, depending on the Most Favored Nation (MFN) status and specific trade agreements. Importers should verify the exact US duty rate based on the country of origin to avoid unexpected costs. Due to their pharmaceutical nature, these products are subject to stringent regulatory controls beyond customs tariffs, including health and safety certifications.

What Are the Import Duty Rates?

🇬🇧 United Kingdom

Code MFN Preferential Unit
2933720000 0.00 % — —

🇪🇺 European Union (TARIC)

Code MFN Preferential Unit
2933720000 0.00 % — —

🇺🇸 United States (HTSUS)

Code MFN Preferential Unit
2933720000 Free — ["kg"]

Duty rates sourced from the USITC (US International Trade Commission) Harmonized Tariff Schedule (HTS) (accessed 2/22/2026), EU TARIC – DG TAXUD (Directorate-General for Taxation and Customs Union) (accessed 2/22/2026), and UK Trade Tariff – HMRC (His Majesty's Revenue and Customs) (accessed 2/22/2026).

Data compiled and presented by HSRates.

How Has Trade Volume Developed?

Trade Volume 2023

US$876.9K
ImportsExports

How to Classify This HS Code?

What products does HS 293372 cover?

This subheading covers Clobazam (INN) and Methyprylon (INN), which are specific heterocyclic compounds with nitrogen hetero-atom(s) only, falling under Heading 2933 of the Harmonized System. Clobazam is an anxiolytic and anticonvulsant benzodiazepine derivative, while Methyprylon is a non-benzodiazepine hypnotic sedative. Both are precisely defined by their International Nonproprietary Names (INN) as established by the World Health Organization (WHO), ensuring consistent identification across international trade. The WCO Harmonized System Explanatory Notes for Chapter 29 and the USITC Harmonized Tariff Schedule (HTS) and EU TARIC system confirm this specific scope, focusing on the pure chemical compounds.

What falls outside HS 293372?

The following products are excluded from HS 293372: pharmaceutical formulations or medicaments containing Clobazam or Methyprylon, which are generally classified in Chapter 30, specifically Heading 3004, if they are put up in measured doses or for retail sale. For instance, tablets containing Clobazam would be classified under 3004. Other heterocyclic compounds, even those with similar therapeutic uses but different chemical structures, are also excluded and would fall under other subheadings within Heading 2933 or other relevant headings in Chapter 29 based on their specific chemical characteristics. Derivatives of Clobazam or Methyprylon that are not themselves Clobazam or Methyprylon (INN) would also be excluded.

What are common classification mistakes for HS 293372?

A common error is misclassifying pharmaceutical preparations containing Clobazam or Methyprylon directly into HS 293372. This is incorrect because HS 293372 is specifically for the pure chemical compounds, not their formulated drug products. According to General Interpretative Rule (GRI) 3(a) and the Chapter 30 Legal Notes, medicaments put up in measured doses or for retail sale are classified under Heading 3004. Another mistake is confusing Clobazam or Methyprylon with other benzodiazepines or hypnotics that have different chemical structures, leading to incorrect classification within other subheadings of Heading 2933 or even entirely different headings in Chapter 29.

How should importers classify products under HS 293372?

The correct procedure for classifying products under HS 293372 requires careful verification of the chemical identity and form. Importers and customs brokers must ensure that the product is precisely Clobazam (INN) or Methyprylon (INN) in its pure chemical form, not a pharmaceutical preparation. This involves reviewing the Certificate of Analysis (CoA) or other chemical documentation to confirm the exact chemical name and purity. If the product is a formulated medicament, it must be classified under Chapter 30, typically Heading 3004. Always apply General Interpretative Rule 1, which states that classification is determined according to the terms of the headings and any relative section or chapter notes, ensuring the product matches the specific INN designation.

Which HS Codes Are Related?

HS 293355 HS 293333 HS 293353 HS 293337 HS 293336 HS 293371

Not the right code? Search all HS codes to find the correct tariff classification.

FAQ

What are the Most Favored Nation (MFN) duty rates for Clobazam (INN) and Methyprylon (INN) under HS 2933.72 in key markets?

The MFN duty rates for products classified under HS 2933.72, specifically Clobazam (INN) and Methyprylon (INN), vary by importing country. For example, the United States generally applies a 'Free' rate for MFN (Normal Trade Relations - NTR) countries, as per the Harmonized Tariff Schedule of the United States (HTSUS) 2933.72.00.00. The European Union's TARIC database indicates a 0.00% ad valorem duty rate for MFN imports under CN code 2933 72 00. The United Kingdom Global Tariff (UKGT) also lists a 0.00% ad valorem duty rate for this heading. Importers should always verify the current rates directly from the official tariff schedules of the destination country (e.g., USITC HTSUS, EU TARIC, UK Trade Tariff).

Are there any preferential duty rates available for Clobazam and Methyprylon under HS 2933.72 through free trade agreements or special programs?

Yes, preferential duty rates may be available for Clobazam (INN) and Methyprylon (INN) under HS 2933.72, depending on the country of origin and the specific trade agreements in force with the importing country. For instance, imports into the United States from countries party to agreements like the USMCA (United States-Mexico-Canada Agreement), CAFTA-DR (Dominican Republic-Central America Free Trade Agreement), or various other FTAs, as well as beneficiaries of programs like the GSP (Generalized System of Preferences), may qualify for a 0.00% duty rate, provided all rules of origin and other program requirements are met. Similarly, the EU and UK have extensive networks of preferential agreements. Importers must ensure they have valid Certificates of Origin or other required documentation to claim preferential treatment. Consult the specific trade agreement's text and the importing country's customs regulations for detailed eligibility criteria.

What are the key classification criteria for Clobazam (INN) and Methyprylon (INN) under HS 2933.72, and what distinguishes them from other heterocyclic compounds?

HS 2933.72 specifically covers 'Lactams; other heterocyclic compounds with nitrogen hetero-atom(s) only; nucleic acids and their salts, whether or not chemically defined; other organic compounds'. The '72' subheading is dedicated to 'Clobazam (INN) and methyprylon (INN)'. The primary classification criterion is the chemical identity of the substance. Clobazam (INN) is a 1,5-benzodiazepine, and Methyprylon (INN) is a piperidinedione derivative. Both are nitrogen-heterocyclic compounds. It is crucial that the product precisely matches the chemical structure and International Nonproprietary Name (INN) specified in the heading. Any derivatives, salts, or isomers not explicitly named or covered by a more specific heading elsewhere in Chapter 29 would require careful review, potentially falling under other subheadings within 2933 or other chapters if they are preparations. The WCO Explanatory Notes for Chapter 29 provide detailed guidance on the classification of specific organic compounds and their derivatives.

What specific documentation is required for the import of Clobazam (INN) and Methyprylon (INN) under HS 2933.72, beyond standard customs declarations?

Beyond standard commercial invoices, packing lists, and bills of lading/air waybills, the import of Clobazam (INN) and Methyprylon (INN) under HS 2933.72 often requires additional documentation due to their nature as pharmaceutical active ingredients, and in some cases, controlled substances. Importers should anticipate needing:

  1. Certificate of Analysis (CoA): Verifying the purity, potency, and chemical identity of the substance.
  2. Safety Data Sheet (SDS): Providing information on hazards and safe handling.
  3. Manufacturer's Declaration: Confirming the product's chemical name, INN, and compliance with specifications.
  4. Import Licenses/Permits: As these are active pharmaceutical ingredients, and Clobazam is a controlled substance in many jurisdictions (e.g., Schedule IV in the US under the DEA), specific import permits or licenses from regulatory bodies (e.g., FDA in the US, EMA in the EU, MHRA in the UK, or national drug control agencies) are almost certainly required prior to shipment.
  5. Certificate of Origin: If claiming preferential duty rates under a free trade agreement. Failure to present the necessary regulatory documentation can lead to significant delays, penalties, or seizure of goods. Importers should consult with regulatory affairs specialists and customs brokers well in advance of shipment.