Phenobarbital Sodium Powder from Mexico
Phenobarbital sodium is the sodium salt of phenobarbital, a barbiturate with a pyrimidine ring structure, used primarily as an anticonvulsant and sedative. It falls under HTS 2933.53.00.00 as it is explicitly listed as phenobarbital (INN) and its salts. This chemically defined heterocyclic compound is imported in bulk powder form for pharmaceutical manufacturing.
Duty Rate — Mexico → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Provide DEA registration and end-use certificates as barbiturates are DEA Schedule IV controlled substances requiring strict import documentation
• Ensure COA (Certificate of Analysis) verifies chemical purity >98% and confirms pyrimidine structure per chapter notes
• Avoid misclassification as finished dosage forms; bulk powders must not be tableted or capsulated