U.S. imports of Sulfonamides (SITC 51580) totaled $38.3M in August 2026, imported from 27 countries.
Importers of Sulfonamides paid $1.6M in duties in August 2026, an average duty rate of 5.39% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Sulfonamides imports of $38.3M in August 2026 ran 60% below the year-to-date monthly average of $95.9M.
Last updated: August 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.
195 import shipments a month
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 109 of 465 in section 5
Basic heading 51580 · $38.3M of $27.5B
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Imports · August 2026
origin
India and Ireland together supply 52% of it. India pays 10.5% duty; Ireland 0.0%.
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.
ImportsExports
Imports
$38.3MYoY · free account
Exports
$8.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.1B of Sulfonamides and exported $146.1M.
Through August 2026. Source: U.S. Census Bureau.