Product classification

HS code for Clonazepam: 2933.91

Heterocyclic compounds, alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam (INN), diazepam (INN), estazolam (INN), ethyl loflazepate (INN), fludiazepam (INN), flunitrazepam (INN), (cont).

Classification of clonazepam under HS 2933.91

Clonazepam is classified under HS code 2933.91, which specifically identifies heterocyclic compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure. As a benzodiazepine derivative, it falls under the broader category of heterocyclic compounds with nitrogen hetero-atom(s) only. The classification is determined by the chemical structure of the molecule, which includes a diazepine ring. According to the General Rules of Interpretation (GRI) 1, classification is determined by the terms of the headings and any relative section or chapter notes. Chapter 29 covers organic chemicals, and heading 2933 is dedicated to heterocyclic compounds with nitrogen hetero-atom(s) only. Subheading 2933.91 is a specific provision for several benzodiazepines, including clonazepam, as listed by the International Nonproprietary Name (INN). This classification applies to the pure chemical substance or bulk powder. If the product is prepared in measured doses or in forms or packings for retail sale as a medicament, it would transition to Chapter 30. However, for international trade of the active pharmaceutical ingredient (API), 2933.91 is the definitive code for customs purposes.

Covers
  • Clonazepam bulk powder (API)
  • Clonazepam USP/BP grade chemical
  • Rivotril bulk substance
  • Klonopin active ingredient
  • Clonazepam reference standards
Also under 2933.91
  • Xanax (Alprazolam)
  • Valium (Diazepam)
  • Klonopin (Clonazepam)
  • Rohypnol (Flunitrazepam)

Codes often confused with 2933.91

Common mistake. Clonazepam is frequently misclassified under HS code 3004.90, which covers medicaments consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses. While finished tablets fall under 3004, the raw chemical substance must stay in 2933.91. Another common error is using 2933.99, which is the residual category for other heterocyclic compounds; however, because clonazepam is explicitly named in the 2933.91 subheading, the more specific code must be used per GRI 3(a).

3004.90Medicaments; consisting of mixed or unmixed products n.e.c. in heading no. 3004, for therapeutic or prophylactic uses, packaged for retail sale30.04Medicaments; (not goods of heading no. 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic use, put up in measured doses (incl. those in the form of transdermal admin. systems) or packed for retail sale2933.99Heterocyclic compounds; n.e.c. in headings no. 2933

Top exporters and importers of HS 293391 (the code used for clonazepam), 2025

In 2025, the largest exporter of HS 293391 (the code used for clonazepam) in UN Comtrade data was Italy, with 31% of world exports; the largest importer in UN Comtrade data was Italy, with 18% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.

Figures cover everything classified under HS 293391, not only clonazepam.

Top exporters 2025 · share of world exports

  1. 1 Italy $51M
  2. 2 United States $47M
  3. 3 India $19M

World total: $164M Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 Italy $29M
  2. 2 Germany $21M
  3. 3 Belgium $15M

World total: $158M Reported figures on UN Comtrade ↗

How these figures are built

109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).

Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.

Brazil NCM codes for clonazepam

Brazil splits HS 2933.91 into 36 NCM codes. Pick the one that matches your product:

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.

Questions about clonazepam

What is the HS code for Clonazepam?

The HS code for Clonazepam is 293391 (Heterocyclic compounds; alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam (INN), diazepam (INN), estazolam (INN), ethyl loflazepate (INN), fludiazepam (INN), flunitrazepam (INN), (cont)). The specific HS code for the chemical substance Clonazepam is 2933.91.

How do I classify Clonazepam for customs?

Clonazepam is classified under HS code 293391 — Heterocyclic compounds; alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam (INN), diazepam (INN), estazolam (INN), ethyl loflazepate (INN), fludiazepam (INN), flunitrazepam (INN), (cont). This is a 6-digit subheading level code.

Is Clonazepam considered a controlled substance for shipping?

Yes, Clonazepam is regulated under the 1971 Convention on Psychotropic Substances. While the HS code identifies the chemical nature, additional permits and documentation are required for its legal transport across international borders.

Which countries are the top exporters of clonazepam (HS 293391)?

In 2025, the top exporters of HS 293391 (the code used for clonazepam) in UN Comtrade data were Italy ($51M, 31% of world exports), the United States ($47M) and India ($19M). World exports came to about $164M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Which countries are the top importers of clonazepam (HS 293391)?

In 2025, the top importers of HS 293391 (the code used for clonazepam) in UN Comtrade data were Italy ($29M, 18% of world imports), Germany ($21M) and Belgium ($15M). World imports came to about $158M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Is the HS code for Clonazepam the same in all countries?

The base HS code 293391 for Clonazepam is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.

What is the NCM code for clonazepam in Brazil?

Brazil splits HS 293391 into 36 NCM codes, so the right one for clonazepam depends on the product's details: 2933.91.11 (Alprazolam), 2933.91.12 (Camazepam), 2933.91.13 (Clonazepam), 2933.91.14 (Clorazepate), 2933.91.15 (Chlordiazepoxide), 2933.91.19 (Salts of alprazolam, camazepam, clonazepam etc), and more.