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SITCSection 5
U.S. imports of sulfonamides (SITC 51580) totaled $161.3M in July 2026, traded with 26 countries.
Importers of Sulfonamides paid $1.5M in duties in July 2026 — an effective duty rate of 6.8% on $21.8M in dutiable value, based on actual customs collections rather than the published tariff schedule. Sulfonamides imports of $161.3M in July 2026 ran 55% above the year-to-date monthly average of $104.1M.
Last updated: July 2026 dataSulfonamides are a class of synthetic antimicrobial compounds widely used as active pharmaceutical ingredients in both human and veterinary medicine, making them a key input for the pharmaceutical manufacturing sector. FDA oversight applies to imported sulfonamide drug substances, and importers must ensure compliance with current Good Manufacturing Practice (cGMP) requirements from approved foreign facilities. Trade in bulk sulfonamide APIs is sensitive to supply-chain concentration, and certain Chinese-origin chemical intermediates in this space have faced Section 301 scrutiny.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
170 shipments/mo
Yes. Bulk sulfonamide APIs imported for pharmaceutical use are subject to FDA review, including cGMP compliance and registration of the foreign manufacturing facility. Shipments may be detained if the facility is not on FDA's approved list or if the product fails specification testing.
Sulfonamides are classified based on their sulfonamide functional group (SO₂NH₂ or derivatives), distinguishing them from sulfonates, sulfones, and other sulfur-containing organics. The precise chemical structure and intended use (pharmaceutical vs. industrial) can affect both the tariff line and any applicable regulatory pathway, so consultation with a licensed customs broker is advisable.
Basic heading 22 of 465 in section 5
Basic heading 51580 · $161.3M of $28.9B
ImportsExports
Imports
$161.3MYoY · Pro
Exports
$6.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Ireland and China together supply 74% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
Supplier Network
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