Polymyxin B Sulfate Powder from Mexico
Polymyxin B sulfate is a polypeptide antibiotic effective against Gram-negative bacteria, used in topical and systemic formulations. Classified under HTS 2941.90.50.00 as an 'other' antibiotic substance in bulk powder form. Meets Chapter 29 requirements for chemically defined organic compounds used primarily as antibiotics.
Duty Rate — Mexico → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals: patented pharma articles — 100% floor rate
9903.05.860%Universal product exemption (U.S. note 52(b))
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
• Include stability data and sterility test results; polymyxins are heat-sensitive and require specific storage declarations
• Declare exact potency (IU/mg) per USP standards to prevent undervaluation disputes at customs
• Confirm not for immediate retail sale; bulk API status prevents shift to Chapter 30 medicaments