HS 293353 Allobarbital (INN), amobarbital (INN), barbital (INN), butalbital (INN), butobarbital, cyclobarbital (INN), methylphenobarbital (INN), pentobarbital (INN), phenobarbital (INN), secbutabarbital (INN), secobarbital (INN) and vinylbital (INN); salts thereof

Quick Answer: HS code 293353 specifically covers a range of barbiturate derivatives and their salts, including well-known substances like phenobarbital, pentobarbital, and amobarbital. These are primarily used as sedatives, hypnotics, or anticonvulsants in pharmaceutical applications. For importers and exporters, understanding the regulatory landscape is crucial. Across major jurisdictions, the Most Favored Nation (MFN) duty rates vary significantly. The UK and EU generally apply a 0.00% ad valorem duty for these products, reflecting their essential medical nature. In contrast, the US tariff schedule shows a "Free" rate for some entries but also a "50%" ad valorem rate under specific conditions, likely related to Column 2 duties or particular trade programs. Importers must verify the exact US tariff line and applicable trade agreements. Given the controlled nature of these substances, additional import/export licenses and permits from health authorities (e.g., DEA in the US, MHRA in the UK) are mandatory, irrespective of the duty rate.

What Are the Import Duty Rates?

🇬🇧 United Kingdom

Code MFN Preferential Unit
2933530000 — — —
2933539000 0.00 % — —
2933531000 0.00 % — —

🇪🇺 European Union (TARIC)

Code MFN Preferential Unit
2933530000 — — —
2933531000 0.00 % — —
2933539000 0.00 % — —

🇺🇸 United States (HTSUS)

Code MFN Preferential Unit
2933530000 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 to Classify This HS Code?

What products does HS 293353 cover?

This subheading covers a specific group of barbituric acid derivatives, their salts, and other heterocyclic compounds with nitrogen hetero-atom(s) only, specifically those listed by name. As defined by the World Customs Organization's Harmonized System Nomenclature and reflected in the USITC Harmonized Tariff Schedule (HTS) and EU TARIC, HS 293353 includes Allobarbital (INN), Amobarbital (INN), Barbital (INN), Butalbital (INN), Butobarbital, Cyclobarbital (INN), Methylphenobarbital (INN), Pentobarbital (INN), Phenobarbital (INN), Secbutabarbital (INN), Secobarbital (INN), and Vinylbital (INN), along with their respective salts. These are all controlled substances primarily used as sedatives or hypnotics in pharmaceutical applications, falling under the broader scope of Heading 2933 for heterocyclic compounds.

What falls outside HS 293353?

The following products are excluded from HS 293353: other barbituric acid derivatives not explicitly named in the subheading, even if chemically similar or having similar therapeutic uses. For instance, Thiopental (INN), a thiobarbiturate, is classified under HS 293359 ("Other") because it contains sulfur in addition to nitrogen in its heterocyclic ring, thus falling outside the specific enumeration of 293353. Similarly, non-barbiturate sedatives or hypnotics, such as benzodiazepines (e.g., Diazepam), are classified under different subheadings within Chapter 29, typically HS 293391 or 293399, depending on their specific chemical structure and heterocyclic ring system. Preparations of these substances, such as tablets or injections, are also excluded and are classified in Chapter 30.

What are common classification mistakes for HS 293353?

A common error is misclassifying other barbituric acid derivatives or related compounds under HS 293353 when they are not explicitly named. Importers sometimes assume that any barbiturate derivative belongs here, overlooking the precise enumeration. For example, a derivative like Primidone, while structurally related to barbiturates, is not listed and therefore falls under HS 293359. Another mistake involves classifying pharmaceutical preparations containing these substances in 293353; however, according to Legal Note 1(a) to Chapter 30, these preparations are classified in Chapter 30, specifically under HS 3004, as medicaments. Proper application of General Interpretative Rule (GRI) 1, which dictates classification by the terms of the headings and any relative section or chapter notes, is crucial to avoid such errors.

How should importers classify products under HS 293353?

The correct procedure for classifying products under HS 293353 involves a meticulous review of the product's chemical name and structure against the specific list provided in the subheading. Importers and customs brokers must first confirm that the substance is one of the explicitly named compounds (e.g., Phenobarbital, Amobarbital) or one of their salts. If the substance is a derivative not explicitly listed, it must be classified elsewhere, likely under HS 293359. Furthermore, it is essential to determine if the product is a pure chemical compound or a pharmaceutical preparation. If it is a preparation intended for therapeutic or prophylactic uses, it should be classified in Chapter 30, typically under HS 3004, in accordance with Chapter 29 Note 1(a) and Chapter 30 Note 1(a). Consulting the WCO Explanatory Notes for Heading 2933 and seeking a binding ruling from the relevant customs authority (e.g., CBP in the US, national customs authorities in the EU) is highly recommended for complex cases.

Which HS Codes Are Related?

HS 293354 HS 293333 HS 293355 HS 293372 HS 293332 HS 293336

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 products classified under HS 2933.53?

For HS 2933.53, which covers specific barbiturates and their salts, the MFN duty rates are frequently 0.00% ad valorem in many major economies. For example, the United States (USITC Harmonized Tariff Schedule, Chapter 29, Subheading 2933.53.00) applies a 'Free' rate of duty for MFN (Normal Trade Relations) countries. Similarly, the European Union's TARIC (Chapter 29, Subheading 2933 53 00) generally lists a 0.00% ad valorem duty rate. Importers should always verify the specific duty rate applicable to their destination country using the official tariff schedule, as rates can vary or be subject to temporary suspensions or changes.

Are there any preferential duty rates available for HS 2933.53 under common trade agreements?

Yes, preferential duty rates are often available for HS 2933.53 under various free trade agreements (FTAs) or Generalized System of Preferences (GSP) schemes, typically resulting in a 0.00% ad valorem rate. For instance, under the United States-Mexico-Canada Agreement (USMCA), goods originating in Mexico or Canada and meeting the rules of origin for HS 2933.53 would generally enter the U.S. duty-free. Similarly, goods imported into the EU from countries with preferential agreements, provided they meet the origin criteria, may also benefit from a 0.00% duty rate. Importers must ensure they have the correct documentation, such as a certificate of origin, to claim preferential treatment. Consult the specific trade agreement's text and the importing country's tariff schedule for precise requirements.

What are the key classification criteria for products under HS 2933.53?

The classification under HS 2933.53 is highly specific, covering 'Allobarbital (INN), amobarbital (INN), barbital (INN), butalbital (INN), butobarbital, cyclobarbital (INN), methylphenobarbital (INN), pentobarbital (INN), phenobarbital (INN), secbutabarbital (INN), secobarbital (INN) and vinylbital (INN); salts thereof'. The primary criteria for classification are the exact chemical identity and structure of the compound. These are heterocyclic compounds containing a pyrimidine ring (a six-membered ring with two nitrogen atoms) in the structure, specifically barbituric acid derivatives. Importers must ensure that the chemical name and structure of their product precisely match one of the listed substances or their salts. A Certificate of Analysis (CoA) or a detailed chemical specification sheet is crucial for accurate classification, demonstrating the specific INN (International Nonproprietary Name) or chemical identity.

What specific documentation is required for importing substances classified under HS 2933.53, given their controlled nature?

Due to the nature of the substances under HS 2933.53 (barbiturates), which are controlled substances in most countries, documentation requirements extend beyond standard customs paperwork. In addition to a commercial invoice, packing list, and bill of lading/air waybill, importers will typically need: 1. Import Permits/Licenses: Issued by the relevant national drug control authority (e.g., DEA in the U.S., national health ministries in other countries). 2. Export Licenses: From the country of origin. 3. International Import Certificate (IIC) / Delivery Verification Certificate (DVC): Often required for international trade in controlled substances under UN conventions. 4. Certificate of Analysis (CoA): Confirming the chemical identity, purity, and concentration. 5. End-Use Certificate: Specifying the intended use (e.g., pharmaceutical manufacturing, research). Importers should consult their national drug regulatory agency and customs authority well in advance of shipment, as requirements are stringent and vary by jurisdiction.

Are there any specific import restrictions or regulatory considerations for HS 2933.53 beyond standard customs procedures?

Yes, substances under HS 2933.53 are subject to significant international and national regulatory controls due to their classification as controlled substances. They fall under international conventions such as the UN Convention on Psychotropic Substances of 1971. This means: 1. Strict Licensing: Both importers and exporters must hold specific licenses issued by their respective national drug control authorities. 2. Quota Systems: Many countries implement annual import quotas for these substances to prevent diversion and control supply. 3. Record-Keeping: Rigorous record-keeping of all transactions (import, export, sales, inventory) is mandatory. 4. Security Requirements: Storage and handling facilities may be subject to specific security standards. 5. Prohibited for General Sale: These substances are generally not permitted for over-the-counter sale and are restricted to licensed pharmaceutical manufacturers, research institutions, or medical facilities. Importers must ensure full compliance with all national drug control laws and regulations in addition to customs requirements.