US bans synthetic cannabinoid MDMB-4en-PINACA
The DEA has placed MDMB-4en-PINACA, a synthetic cannabinoid, into Schedule I of the Controlled Substances Act effective immediately. This action prohibits manufacture, distribution, import, export, possession, and research with the substance and its salts and isomers. The placement aligns the US with international obligations under the 1971 Convention on Psychotropic Substances and subjects violators to federal criminal penalties.
Photo: Swastik Arora / Pexels# US Places Synthetic Cannabinoid MDMB-4en-PINACA in Schedule I
The Drug Enforcement Administration (DEA) has issued a final rule scheduling methyl 3,3-dimethyl-2-(1-(pent-4-en-1-yl)-1H-indazole-3-carboxamido)butanoate—commonly known as MDMB-4en-PINACA—as a Schedule I controlled substance under the Controlled Substances Act, effective as of the Federal Register publication on April 24, 2026.
What is MDMB-4en-PINACA?
MDMB-4en-PINACA is a synthetic cannabinoid, part of a class of designer drugs engineered to mimic the effects of cannabis. The DEA's action covers the substance itself, plus all its salts, isomers, and salts of isomers wherever possible.
Scope of Restrictions
According to the DEA final rule:
"This action imposes regulatory controls and administrative, civil, and criminal sanctions applicable to schedule I controlled substances on persons who handle (manufacture, distribute, reverse distribute, import, export, engage in research, conduct instructional activities or chemical analysis with, or possess) or propose to handle MDMB-4en-PINACA."
Schedule I classification is the most restrictive category under US federal law, reserved for substances with no accepted medical use and a high potential for abuse.
International Compliance
The DEA states the action is taken "in part, to enable the United States to meet its obligations under the 1971 Convention on Psychotropic Substances." This move aligns US domestic law with international drug-control treaties, closing potential loopholes in border enforcement.
Impact on Logistics and Trade
For shippers and freight forwarders, MDMB-4en-PINACA is now prohibited from import into and export from the United States. Any chemical precursors, finished goods, or research samples containing this substance or its analogs cannot legally cross US borders. Customs will enforce seizure of shipments, and declarants face potential criminal liability.
While this substance does not fall under traditional tariff chapters (HS codes for organic chemicals in Chapter 29 may include reference materials, but Schedule I status overrides commercial classification), the regulatory prohibition is absolute and supersedes commercial logistics considerations.
What this means for shippers
Shippers, customs brokers, and freight forwarders must immediately update their restricted-substance screening to flag MDMB-4en-PINACA and related synthetics. Any declaration or manifest involving this compound triggers refusal of entry and potential criminal referral. Consult legal counsel and compliance teams before handling any inquiry involving this substance. For questions about import regulations and controlled materials, see our guide to sanctions compliance.
